Same here using Firefox 2.0.0.1
Pressed reply button in this threat, then i got the login screen.
Putting my credentials and switching in "Remember me".
Then i get "Thanks for logging in ...." and come back to the login screen.
Only F5 refresh helps me out.
"feels" for me, that it's going a bit better when using "Remember me".
It's the Astaro proxy. Despite no caching activated, it seems to cache.
Just had another issue, where the config from the Astaro GUI was cached. While configuring one system, I just realized, that the configuration shown was from a system I configured a couple of hours before. First thought it was the cache of IE, but I got the same with Firefox on windows and linux. Only bypassing the proxy did solve the problem.
Maybe we should move this to the HTTP Proxy section.