[gentoo-user] ReactOS with Virtual Box: B.O.D. Black Screen of (?)death(?)

Hi,

I tried to install ReactOS into my Virtual Box which went fine
so far.
Booting itsself was no problem either....but instead of getting 
a desktop I got a simple uniform black screen.
No error messages so far...nothing....only the black void.

bugs.gentoo.org when searched for "ReactOS" or "black screen"
shows nothing related.

In the internet I found one anchient message from glorious
times, when bugs were real bugs ... <wrong movie...sorry>...
a message, which is no longer related due to its age.

Does someone run ReactOS successfully with virtualbox
and knows how to circumvent this BOD?

Thanks a lot in advance!
Cheers!
Meino