Beta5 (Beta4) and Xen

Hallo,
tried Beta5 (and Beta4), they run good. Only Xen won’t work. Installing Xen via Yast worked fine - no errors.
Failure appear when rebooting into Xen - kernel won’t boot; it is not able to detect the dvd-writer and the disk. Without xen the same kernel runs without problems.
Any ideas ?

Greetings
Werner