When the session expires, a scrollbar disappears 'forever'

[Cosmo Myzrail Gorynych aka CoMiGo]

If you are working on a long page with lots of fields and a scrollbar and go away for 5-10 minutes, a pop-up message will appear telling that the session has expired, and the vertical scrollbar will disappear.

If we log in again, the pop-up will close, but the vertical scrollbar will not appear again.

Of course it is not very dangerous 'cause everything is already saved and I can just refresh the page, buuuut it's still a bug :D