diff --git a/.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/stale_banner.dart b/.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/stale_banner.dart
index b3f93ae..5d6e430 100644
--- a/.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/stale_banner.dart
+++ b/.agents/skills/multi-agent-mux-ui/apps/mam_desktop/lib/src/widgets/stale_banner.dart
@@ -12,11 +12,12 @@ class StaleBanner extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    if (!poll.stale) return const SizedBox.shrink();
+    final shouldShow = poll.stale || (poll.snapshot == null && poll.error != null);
+    if (!shouldShow) return const SizedBox.shrink();
 
     final lastOk = poll.lastOkAt;
     final lastOkText = lastOk == null
-        ? '?'
+        ? 'never'
         : '${lastOk.hour.toString().padLeft(2, '0')}:'
               '${lastOk.minute.toString().padLeft(2, '0')}:'
               '${lastOk.second.toString().padLeft(2, '0')}';
diff --git a/.agents/skills/multi-agent-mux-ui/packages/mam_core/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA= b/.agents/skills/multi-agent-mux-ui/packages/mam_core/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA=
index de3177f..b373850 100644
Binary files a/.agents/skills/multi-agent-mux-ui/packages/mam_core/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA= and b/.agents/skills/multi-agent-mux-ui/packages/mam_core/.dart_tool/test/incremental_kernel.Ly9AZGFydD0zLjA= differ