I was trying to reproduce bug 73003.

1. Login on beta labs
2. Visit a Flow board and hide a topic.
3. In another tab I logged out of beta labs.
4. Then click Undo in the "This topic has been hidden _Undo_" moderated titlebar

Result: in the browser console Net tab the API response to the unhide operation is

"error":{"code":"permissions","info":"Insufficient permissions to execute this action.","permissions":null, ...

as expected. But there's no indication of failure in the UI, this error is not displayed anywhere.

Expected: the API failure displays in a pink errorbox near Undo.

On a local wiki you can replace step 3 with rename api.php to api_DISABLED.php; you'll see a 503 error in the Net tab.

Version: master
Severity: normal