Plesk 8.4.0 login not possible

[Robert Hoehn]

I have a small problem with Plesk on my LAMP Server. If I try to login I only get the following login screen:
http://serversupportforum.de/forum/...plesk-8-4-0-login-unm-glich-plesk_problem.jpg

I can not type in anything. I still looks endless onto "please wait" Logo.
Shell access in no problem and all website I hosted run`s normal.