diff --git a/lib/vidmoly-upload.js b/lib/vidmoly-upload.js
index e4e8d07..f4e70d5 100644
--- a/lib/vidmoly-upload.js
+++ b/lib/vidmoly-upload.js
@@ -111,12 +111,22 @@ class VidmolyUploader {
       throw new Error('Vidmoly Login fehlgeschlagen: Falscher Username oder Passwort');
     }
 
-    // Check for login cookie
-    const hasSession = this.cookies.has('login') || this.cookies.has('xfsts') ||
-      this.cookies.size > 1;
-    if (!hasSession) {
+    // Verify session by fetching a logged-in-only page. Vidmoly redesigned
+    // the site and changed cookie names, so the old "has cookie 'login' or
+    // 'xfsts'" heuristic broke. Instead we hit /?op=my_account (or similar)
+    // and confirm we're not redirected to the login form.
+    if (this.cookies.size === 0) {
       throw new Error('Vidmoly Login fehlgeschlagen: Keine Session erhalten');
     }
+    const verifyRes = await this._fetch(`${BASE_URL}/?op=my_account`);
+    const verifyBody = await verifyRes.text();
+    // A logged-out page shows the login form (name="login" + name="password");
+    // a logged-in page shows account info ("Logout", "My Account", "My Files").
+    const looksLoggedIn = /(?:logout|my[_ ]?account|my[_ ]?files)/i.test(verifyBody)
+      && !/<form[^>]*>\s*[\s\S]{0,500}?name=["']password["']/i.test(verifyBody);
+    if (!looksLoggedIn) {
+      throw new Error('Vidmoly Login fehlgeschlagen: Session konnte nicht verifiziert werden');
+    }
   }
 
   /**
diff --git a/renderer/app.js b/renderer/app.js
index 795110e..f6f4c76 100644
--- a/renderer/app.js
+++ b/renderer/app.js
@@ -1886,8 +1886,19 @@ function handleStats(data) {
 // --- Retry ---
 async function retrySelectedJobs() {
   const retryJobs = [];
+  // Build a Set for O(1) selectedFiles dedup below.
+  const existingFilePaths = new Set();
+  for (const f of selectedFiles) existingFilePaths.add(f.path);
+
   queueJobs.forEach(j => {
     if (selectedJobIds.has(j.id) && ['error', 'done', 'aborted', 'skipped'].includes(j.status)) {
+      // Invalidate the old uploadId: retire the index entry and mark it so
+      // any late progress event from the previous (cancelled/completed)
+      // upload can't overwrite the freshly-reset state.
+      if (j.uploadId) {
+        _jobIndexByUploadId.delete(j.uploadId);
+        _deletedJobIds.add(j.uploadId);
+      }
       j.status = uploading ? 'queued' : 'preview';
       j.error = null;
       j.result = null;
@@ -1898,8 +1909,9 @@ async function retrySelectedJobs() {
       j.progress = 0;
       j.uploadId = null;
       retryJobs.push(j);
-      if (!selectedFiles.find(f => f.path === j.file || f.name === j.fileName)) {
+      if (!existingFilePaths.has(j.file)) {
         selectedFiles.push({ path: j.file, name: j.fileName, size: j.bytesTotal });
+        existingFilePaths.add(j.file);
       }
     }
   });
@@ -2868,14 +2880,15 @@ function setupAccountDragReorder(container) {
 async function toggleAccount(accountId) {
   const found = findAccountById(accountId);
   if (!found) return;
-  found.account.enabled = found.account.enabled === false ? true : false;
-  await window.api.saveConfig({ hosters: config.hosters });
-  config = await window.api.getConfig();
+  // Flip in place; re-render immediately so the UI responds before the
+  // disk write completes. The saveConfig is fire-and-forget-ish here because
+  // we already know the new state locally — a full getConfig round-trip
+  // after every toggle made rapid enable/disable clicks feel laggy.
+  found.account.enabled = !found.account.enabled;
   syncSelectedUploadHosters();
   renderAccounts();
   renderHosterSummary();
-  renderHosterModal();
-  renderSettings();
+  try { await window.api.saveConfig({ hosters: config.hosters }); } catch {}
 }
 
 async function checkSingleAccount(accountId) {