>>Can you give a link to that thread?
>
>Message #1600885

I didn't read that message then (opens fine now), but I remember I had one of those "unexpected" messages last week. It was a bit persistent, for a while anything I clicked on the top treeview gave the same result. After a few retries even backtracking (i.e. going through browser history) stopped working, and I had to close the UT tab (which I almost never do - I close the browser, and that's only when I reboot). The next day I noticed I was disoriented, the UT tab was missing :). Logged in and everything was normal.

It says my last login was on 30-may-2014, so this must have happened on 29th, anytime between 20:00 and 24:00 CET.