diff --git a/api/models/Conversation.js b/api/models/Conversation.js
index 1515a28259..73841fa9b7 100644
--- a/api/models/Conversation.js
+++ b/api/models/Conversation.js
@@ -192,7 +192,9 @@ module.exports = {
 
     try {
       const convos = await Conversation.find(query)
-        .select('conversationId endpoint title createdAt updatedAt user')
+        .select(
+          'conversationId endpoint title createdAt updatedAt user model agent_id assistant_id',
+        )
         .sort({ updatedAt: order === 'asc' ? 1 : -1 })
         .limit(limit + 1)
         .lean();
diff --git a/client/src/components/Nav/SettingsTabs/Speech/Speech.tsx b/client/src/components/Nav/SettingsTabs/Speech/Speech.tsx
index 11743cb0ed..0eaf2ffd0c 100644
--- a/client/src/components/Nav/SettingsTabs/Speech/Speech.tsx
+++ b/client/src/components/Nav/SettingsTabs/Speech/Speech.tsx
@@ -136,6 +136,14 @@ function Speech() {
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [data]);
 
+  // Reset engineTTS if it is set to a removed/invalid value (e.g., 'edge')
+  useEffect(() => {
+    const validEngines = ['browser', 'external'];
+    if (!validEngines.includes(engineTTS)) {
+      setEngineTTS('browser');
+    }
+  }, [engineTTS, setEngineTTS]);
+
   logger.log({ sttExternal, ttsExternal });
 
   const contentRef = useRef(null);
diff --git a/client/src/components/Nav/SettingsTabs/Speech/TTS/VoiceDropdown.tsx b/client/src/components/Nav/SettingsTabs/Speech/TTS/VoiceDropdown.tsx
index 3645474115..1e4dd2ecfe 100644
--- a/client/src/components/Nav/SettingsTabs/Speech/TTS/VoiceDropdown.tsx
+++ b/client/src/components/Nav/SettingsTabs/Speech/TTS/VoiceDropdown.tsx
@@ -12,5 +12,9 @@ export default function VoiceDropdown() {
   const engineTTS = useRecoilValue<string>(store.engineTTS);
   const VoiceDropdownComponent = voiceDropdownComponentsMap[engineTTS];
 
+  if (!VoiceDropdownComponent) {
+    return null;
+  }
+
   return <VoiceDropdownComponent />;
 }
diff --git a/client/src/hooks/Agents/useSelectAgent.ts b/client/src/hooks/Agents/useSelectAgent.ts
index 1c785c0d98..abeda4c17c 100644
--- a/client/src/hooks/Agents/useSelectAgent.ts
+++ b/client/src/hooks/Agents/useSelectAgent.ts
@@ -4,8 +4,9 @@ import { EModelEndpoint, isAgentsEndpoint, Constants, QueryKeys } from 'librecha
 import type { TConversation, TPreset, Agent } from 'librechat-data-provider';
 import useDefaultConvo from '~/hooks/Conversations/useDefaultConvo';
 import { useAgentsMapContext } from '~/Providers/AgentsMapContext';
-import { useGetAgentByIdQuery } from '~/data-provider';
 import { useChatContext } from '~/Providers/ChatContext';
+import { useGetAgentByIdQuery } from '~/data-provider';
+import { logger } from '~/utils';
 
 export default function useSelectAgent() {
   const queryClient = useQueryClient();
@@ -22,6 +23,7 @@ export default function useSelectAgent() {
 
   const updateConversation = useCallback(
     (agent: Partial<Agent>, template: Partial<TPreset | TConversation>) => {
+      logger.log('conversation', 'Updating conversation with agent', agent);
       if (isAgentsEndpoint(conversation?.endpoint)) {
         const currentConvo = getDefaultConversation({
           conversation: { ...(conversation ?? {}), agent_id: agent.id },
diff --git a/client/src/hooks/Assistants/useSelectAssistant.ts b/client/src/hooks/Assistants/useSelectAssistant.ts
index 5f3a5e9cee..c3710503e8 100644
--- a/client/src/hooks/Assistants/useSelectAssistant.ts
+++ b/client/src/hooks/Assistants/useSelectAssistant.ts
@@ -4,7 +4,7 @@ import type { AssistantsEndpoint, TConversation, TPreset } from 'librechat-data-
 import useDefaultConvo from '~/hooks/Conversations/useDefaultConvo';
 import { useChatContext } from '~/Providers/ChatContext';
 import useAssistantListMap from './useAssistantListMap';
-import { mapAssistants } from '~/utils';
+import { mapAssistants, logger } from '~/utils';
 
 export default function useSelectAssistant(endpoint: AssistantsEndpoint) {
   const getDefaultConversation = useDefaultConvo();
@@ -24,6 +24,7 @@ export default function useSelectAssistant(endpoint: AssistantsEndpoint) {
         conversationId: 'new',
       };
 
+      logger.log('conversation', 'Updating conversation with assistant', assistant);
       if (isAssistantsEndpoint(conversation?.endpoint)) {
         const currentConvo = getDefaultConversation({
           conversation: { ...(conversation ?? {}) },
diff --git a/client/src/hooks/Conversations/useGenerateConvo.ts b/client/src/hooks/Conversations/useGenerateConvo.ts
index 8f545161a2..0c0728ddec 100644
--- a/client/src/hooks/Conversations/useGenerateConvo.ts
+++ b/client/src/hooks/Conversations/useGenerateConvo.ts
@@ -11,7 +11,7 @@ import type {
 } from 'librechat-data-provider';
 import type { SetterOrUpdater } from 'recoil';
 import type { AssistantListItem } from '~/common';
-import { getEndpointField, buildDefaultConvo, getDefaultEndpoint } from '~/utils';
+import { getEndpointField, buildDefaultConvo, getDefaultEndpoint, logger } from '~/utils';
 import useAssistantListMap from '~/hooks/Assistants/useAssistantListMap';
 import { useGetEndpointsQuery } from '~/data-provider';
 import { mainTextareaId } from '~/common';
@@ -44,6 +44,7 @@ const useGenerateConvo = ({
           conversationId: rootConvo.conversationId,
         } as TConversation;
 
+        logger.log('conversation', 'Setting conversation from `useNewConvo`', update);
         return update;
       });
     }
diff --git a/client/src/hooks/Conversations/useNavigateToConvo.tsx b/client/src/hooks/Conversations/useNavigateToConvo.tsx
index a329a7ca67..88c6eaeda7 100644
--- a/client/src/hooks/Conversations/useNavigateToConvo.tsx
+++ b/client/src/hooks/Conversations/useNavigateToConvo.tsx
@@ -1,7 +1,13 @@
 import { useSetRecoilState } from 'recoil';
 import { useNavigate } from 'react-router-dom';
 import { useQueryClient } from '@tanstack/react-query';
-import { QueryKeys, EModelEndpoint, LocalStorageKeys, Constants } from 'librechat-data-provider';
+import {
+  QueryKeys,
+  Constants,
+  dataService,
+  EModelEndpoint,
+  LocalStorageKeys,
+} from 'librechat-data-provider';
 import type { TConversation, TEndpointsConfig, TModelsConfig } from 'librechat-data-provider';
 import { buildDefaultConvo, getDefaultEndpoint, getEndpointField, logger } from '~/utils';
 import store from '~/store';
@@ -14,6 +20,21 @@ const useNavigateToConvo = (index = 0) => {
   const setSubmission = useSetRecoilState(store.submissionByIndex(index));
   const { hasSetConversation, setConversation } = store.useCreateConversationAtom(index);
 
+  const fetchFreshData = async (conversationId?: string | null) => {
+    if (!conversationId) {
+      return;
+    }
+    try {
+      const data = await queryClient.fetchQuery([QueryKeys.conversation, conversationId], () =>
+        dataService.getConversationById(conversationId),
+      );
+      logger.log('conversation', 'Fetched fresh conversation data', data);
+      setConversation(data);
+    } catch (error) {
+      console.error('Error fetching conversation data on navigation', error);
+    }
+  };
+
   const navigateToConvo = (
     conversation?: TConversation | null,
     _resetLatestMessage = true,
@@ -23,6 +44,7 @@ const useNavigateToConvo = (index = 0) => {
       logger.warn('conversation', 'Conversation not provided to `navigateToConvo`');
       return;
     }
+    logger.log('conversation', 'Navigating to conversation', conversation);
     hasSetConversation.current = true;
     setSubmission(null);
     if (_resetLatestMessage) {
@@ -60,6 +82,10 @@ const useNavigateToConvo = (index = 0) => {
     clearAllConversations(true);
     setConversation(convo);
     navigate(`/c/${convo.conversationId ?? Constants.NEW_CONVO}`);
+    if (convo.conversationId !== Constants.NEW_CONVO && convo.conversationId) {
+      queryClient.invalidateQueries([QueryKeys.conversation, convo.conversationId]);
+      fetchFreshData(convo.conversationId);
+    }
   };
 
   const navigateWithLastTools = (
diff --git a/client/src/hooks/Input/useQueryParams.ts b/client/src/hooks/Input/useQueryParams.ts
index d6bb90b210..a2f7344f0d 100644
--- a/client/src/hooks/Input/useQueryParams.ts
+++ b/client/src/hooks/Input/useQueryParams.ts
@@ -11,7 +11,7 @@ import {
 } from 'librechat-data-provider';
 import type { TPreset, TEndpointsConfig, TStartupConfig } from 'librechat-data-provider';
 import type { ZodAny } from 'zod';
-import { getConvoSwitchLogic, getModelSpecIconURL, removeUnavailableTools } from '~/utils';
+import { getConvoSwitchLogic, getModelSpecIconURL, removeUnavailableTools, logger } from '~/utils';
 import useDefaultConvo from '~/hooks/Conversations/useDefaultConvo';
 import { useChatContext, useChatFormContext } from '~/Providers';
 import useSubmitMessage from '~/hooks/Messages/useSubmitMessage';
@@ -159,6 +159,7 @@ export default function useQueryParams({
         });
 
         /* We don't reset the latest message, only when changing settings mid-converstion */
+        logger.log('conversation', 'Switching conversation from query params', currentConvo);
         newConversation({
           template: currentConvo,
           preset: newPreset,
diff --git a/client/src/hooks/Input/useSelectMention.ts b/client/src/hooks/Input/useSelectMention.ts
index ce5d2ed55f..af61447480 100644
--- a/client/src/hooks/Input/useSelectMention.ts
+++ b/client/src/hooks/Input/useSelectMention.ts
@@ -9,7 +9,7 @@ import type {
   TEndpointsConfig,
 } from 'librechat-data-provider';
 import type { MentionOption, ConvoGenerator } from '~/common';
-import { getConvoSwitchLogic, getModelSpecIconURL, removeUnavailableTools } from '~/utils';
+import { getConvoSwitchLogic, getModelSpecIconURL, removeUnavailableTools, logger } from '~/utils';
 import { useChatContext } from '~/Providers';
 import { useDefaultConvo } from '~/hooks';
 import store from '~/store';
@@ -86,6 +86,7 @@ export default function useSelectMention({
         });
 
         /* We don't reset the latest message, only when changing settings mid-converstion */
+        logger.info('conversation', 'Switching conversation to new spec (modular)', conversation);
         newConversation({
           template: currentConvo,
           preset,
@@ -95,6 +96,7 @@ export default function useSelectMention({
         return;
       }
 
+      logger.info('conversation', 'Switching conversation to new spec', conversation);
       newConversation({
         template: { ...(template as Partial<TConversation>) },
         preset,
@@ -172,6 +174,11 @@ export default function useSelectMention({
         });
 
         /* We don't reset the latest message, only when changing settings mid-converstion */
+        logger.info(
+          'conversation',
+          'Switching conversation to new endpoint/model (modular)',
+          currentConvo,
+        );
         newConversation({
           template: currentConvo,
           preset: currentConvo,
@@ -181,6 +188,7 @@ export default function useSelectMention({
         return;
       }
 
+      logger.info('conversation', 'Switching conversation to new endpoint/model', template);
       newConversation({
         template: { ...(template as Partial<TConversation>) },
         preset: { ...kwargs, spec: null, iconURL: null, modelLabel: null, endpoint: newEndpoint },
@@ -230,6 +238,7 @@ export default function useSelectMention({
         });
 
         /* We don't reset the latest message, only when changing settings mid-converstion */
+        logger.info('conversation', 'Switching conversation to new preset (modular)', currentConvo);
         newConversation({
           template: currentConvo,
           preset: newPreset,
@@ -239,6 +248,7 @@ export default function useSelectMention({
         return;
       }
 
+      logger.info('conversation', 'Switching conversation to new preset', template);
       newConversation({ preset: newPreset, keepAddedConvos: isModular });
     },
     [
diff --git a/client/src/hooks/useNewConvo.ts b/client/src/hooks/useNewConvo.ts
index 3054f879e7..f5933cc547 100644
--- a/client/src/hooks/useNewConvo.ts
+++ b/client/src/hooks/useNewConvo.ts
@@ -31,6 +31,7 @@ import useAssistantListMap from './Assistants/useAssistantListMap';
 import { useResetChatBadges } from './useChatBadges';
 import { usePauseGlobalAudio } from './Audio';
 import { mainTextareaId } from '~/common';
+import { logger } from '~/utils';
 import store from '~/store';
 
 const useNewConvo = (index = 0) => {
@@ -151,6 +152,7 @@ const useNewConvo = (index = 0) => {
         if (!(keepAddedConvos ?? false)) {
           clearAllConversations(true);
         }
+        logger.log('conversation', 'Setting conversation from `useNewConvo`', conversation);
         setConversation(conversation);
         setSubmission({} as TSubmission);
         if (!(keepLatestMessage ?? false)) {
diff --git a/client/src/routes/ChatRoute.tsx b/client/src/routes/ChatRoute.tsx
index 3e66ed8c13..4ce9cdef9e 100644
--- a/client/src/routes/ChatRoute.tsx
+++ b/client/src/routes/ChatRoute.tsx
@@ -1,16 +1,16 @@
-import { useEffect, useRef } from 'react';
+import { useEffect } from 'react';
 import { useParams } from 'react-router-dom';
 import { Constants, EModelEndpoint } from 'librechat-data-provider';
 import { useGetModelsQuery } from 'librechat-data-provider/react-query';
 import type { TPreset } from 'librechat-data-provider';
 import {
-  useGetConvoIdQuery,
   useHealthCheck,
-  useGetEndpointsQuery,
+  useGetConvoIdQuery,
   useGetStartupConfig,
+  useGetEndpointsQuery,
 } from '~/data-provider';
 import { useNewConvo, useAppStartup, useAssistantListMap } from '~/hooks';
-import { getDefaultModelSpec, getModelSpecIconURL } from '~/utils';
+import { getDefaultModelSpec, getModelSpecIconURL, logger } from '~/utils';
 import { ToolCallsMapProvider } from '~/Providers';
 import ChatView from '~/components/Chat/ChatView';
 import useAuthRedirect from './useAuthRedirect';
@@ -38,11 +38,6 @@ export default function ChatRoute() {
   const { hasSetConversation, conversation } = store.useCreateConversationAtom(index);
   const { newConversation } = useNewConvo();
 
-  // Reset the guard flag whenever conversationId changes
-  useEffect(() => {
-    hasSetConversation.current = false;
-  }, [conversationId]);
-
   const modelsQuery = useGetModelsQuery({
     enabled: isAuthenticated,
     refetchOnMount: 'always',
@@ -53,6 +48,9 @@ export default function ChatRoute() {
   const endpointsQuery = useGetEndpointsQuery({ enabled: isAuthenticated });
   const assistantListMap = useAssistantListMap();
 
+  /** This effect is mainly for the first conversation state change on first load of the page.
+   *  Adjusting this may have unintended consequences on the conversation state.
+   */
   useEffect(() => {
     const shouldSetConvo =
       (startupConfig && !hasSetConversation.current && !modelsQuery.data?.initial) ?? false;
@@ -63,7 +61,7 @@ export default function ChatRoute() {
 
     if (conversationId === Constants.NEW_CONVO && endpointsQuery.data && modelsQuery.data) {
       const spec = getDefaultModelSpec(startupConfig);
-
+      logger.log('conversation', 'ChatRoute, new convo effect', conversation);
       newConversation({
         modelsData: modelsQuery.data,
         template: conversation ? conversation : undefined,
@@ -80,6 +78,7 @@ export default function ChatRoute() {
 
       hasSetConversation.current = true;
     } else if (initialConvoQuery.data && endpointsQuery.data && modelsQuery.data) {
+      logger.log('conversation', 'ChatRoute initialConvoQuery', initialConvoQuery.data);
       newConversation({
         template: initialConvoQuery.data,
         /* this is necessary to load all existing settings */
@@ -94,6 +93,7 @@ export default function ChatRoute() {
       assistantListMap[EModelEndpoint.azureAssistants]
     ) {
       const spec = getDefaultModelSpec(startupConfig);
+      logger.log('conversation', 'ChatRoute new convo, assistants effect', conversation);
       newConversation({
         modelsData: modelsQuery.data,
         template: conversation ? conversation : undefined,
@@ -112,6 +112,7 @@ export default function ChatRoute() {
       assistantListMap[EModelEndpoint.assistants] &&
       assistantListMap[EModelEndpoint.azureAssistants]
     ) {
+      logger.log('conversation', 'ChatRoute convo, assistants effect', initialConvoQuery.data);
       newConversation({
         template: initialConvoQuery.data,
         preset: initialConvoQuery.data as TPreset,
@@ -127,7 +128,6 @@ export default function ChatRoute() {
     endpointsQuery.data,
     modelsQuery.data,
     assistantListMap,
-    conversationId,
   ]);
 
   if (endpointsQuery.isLoading || modelsQuery.isLoading) {