Composing new mail only works in new window

Hi

Since I have upgraded to V8.0 OSS on my ubuntu 10.04 64bit server, I have not been able to view the meassage body field when I try to write a new mail, or replys to a mail.

All I'm etting s this.:

Attachment 5271

If I press the "Open in a new window" botton it works fine.

I have a test server running, and on that server theres no problem in seeing the message body. I have tried with a reinstall, but that did'nt help.

Can anybody help me by telling me how to debug the web interface ?

Thanks!!!

Jan