Can't read the text of my Mails in Roundcube 0.8 and Opera

[Schmatze]

Hi, I just installed the brand new Roundcube 0.8 final on my server. But I can't use it with Opera 12.1. The text of the Mails are not readable. It has the same colour as the background. Even if I select it with the courser I'm not able to read it.

Is it a bug of roundcube, of my server or Opera?

Greetings

[alec]

Works for me with Opera 12.01 on Linux.

[Schmatze]

I made a screenshot.

http://s7.directupload.net/file/d/2977/vxb8tfn2_png.htm

How could I fix this?

P.S. this only happens with Opera. In Safari it seems to be ok.

P.S.S. I can my read mails if I open them separately.