Created attachment 924413 [details]
Description of problem:
I rebooted the engine while logging in and got this error dialog.
It blends into the background.
Alexander - thoughts about that?
Is it ux generic issue, or infra one?
Since the engine is not available, the resources cannot be loaded and thus you end up with what you see in the screenshot. The next obvious question is why can't it find those resources in the browser cache? The borders are the same as any other popup in the webadmin application. Answer is I am not sure, we mark all our css/images/js to be cached forever which should stop it from doing an ETag check, but if it does do an ETag check it would fail that due to the engine not being fully up and you would get a 404 instead of the resource.
Due to Comment #2, closing this one as WONTFIX.