Console - Error input too long

Hello,

I recently installed a new Debian Wheezy System with Proxmox 3 and created the first QEMU VM.
Now. When I start the VM (works perfectly) and want to open the console I'm getting an error.
The popup with the console opens and there where the Java Applet was in Proxmox 2 is only a text telling me:
Error input too long - aborting (500)

Now this keeps me from installing the VM since the port is also not opened (don't see anything in the log window about that), so I can't connect with an external VNC Client.

Since Proxmox 3 doesn't use Apache 2 anymore I have no idea where a log file is that can tell me more.
Syslog only shows the authentication successful.

The only thing I changed is the SSL certificate.

Hope someone can help me with that and thanks for the help ;)

Yours,
Marc