I have uploaded the latest upgrade to Jdownloader.
The ServerError ptoblerm has disappeared.
I have now another problem. When I enable my filesreve account in Jdownloader, it goes to "Unlimited, no traffic left" before switching again to invalid account.
The account was working fine until last week. It is still valid when I connect to fileserve itself.
Log file:
http://jdownloader.org/pastebin/50457