Ok, there is an Xorg.0.log and a YaST2/y2start.log on the stick. After the crash I waited for 5 mins and prayed the disk blocks make it to the stick, but unfortunately, both have exactly 0 bytes length, so no use. If there are any new ideas, please tell, in the meantime I'll try again when the official release is out, but I'm happy anyway. Thanks a lot!