diff --git a/frontend/src/dialogues/socialnetwork/VocabPracticeDialog.vue b/frontend/src/dialogues/socialnetwork/VocabPracticeDialog.vue
index 0f986dc..fd61b1c 100755
--- a/frontend/src/dialogues/socialnetwork/VocabPracticeDialog.vue
+++ b/frontend/src/dialogues/socialnetwork/VocabPracticeDialog.vue
@@ -143,7 +143,9 @@ const PRACTICE_MIN_EXPOSURES = 3;
 // The original daily batch remains stable when the dialog is reopened.
 // Keep in sync with VocabCourseView. v3 discards legacy empty sessions that
 // could block cards due later on the same calendar day.
-const SRS_SESSION_STORAGE_VERSION = 3;
+// Keep this in sync with VocabCourseView. Version 4 discards stale empty
+// sessions that could mask a new daily SRS batch.
+const SRS_SESSION_STORAGE_VERSION = 4;
 const HARD_REQUIRED_CONSECUTIVE_CORRECT = 5;
 const MAX_DAILY_DUE = 50;
 const MAX_DAILY_HARD_VOCABS = 7;
diff --git a/frontend/src/views/social/VocabCourseView.vue b/frontend/src/views/social/VocabCourseView.vue
index bb727fc..ec412e8 100755
--- a/frontend/src/views/social/VocabCourseView.vue
+++ b/frontend/src/views/social/VocabCourseView.vue
@@ -377,7 +377,9 @@ import { localizeVocabCourseTitle } from '@/utils/vocabCourseTitle.js';
 
 // v3 invalidates old empty daily sessions. Those could be created before a
 // scheduled card became visible and then incorrectly hide today's due batch.
-const SRS_SESSION_STORAGE_VERSION = 3;
+// Version 4 invalidates the old zero-card day sessions. Those sessions could
+// hide a server-reported due backlog for the rest of a calendar day.
+const SRS_SESSION_STORAGE_VERSION = 4;
 
 export default {
   name: 'VocabCourseView',
@@ -602,11 +604,11 @@ export default {
           return;
         }
         const total = Math.max(0, Number(session.initialTotalDue) || 0);
-        // A session with no originally scheduled cards must not take
-        // precedence over cards that are now due. This happened when the
-        // page was opened before the old time-of-day threshold and kept a
-        // zero-card session for the rest of the calendar day.
-        if (total === 0 && this.srsDueItems.length > 0) {
+        // A session with no originally scheduled cards must never take
+        // precedence over a server-reported due backlog. Check the server
+        // total rather than just the loaded first page of cards: an empty or
+        // late item array must not turn e.g. "588 due" into "0 of 0 today".
+        if (total === 0 && this.srsDueCount > 0) {
           localStorage.removeItem(key);
           this.srsTodayRemaining = null;
           this.srsTodayQuota = null;