Suse Tumbleweed: VirtualBox 7.0.4-2.1: none of the virtual machines starts up

Tried to start one of my virtual machines, that were all working with Virtualbox 6.1.X, but it got stuck in the black boot screen. Same for all other virtual machines, that were working on the previous 6.1.X versions. Does anybody have a solution for this on Suse Tumbleweed? Is there a way to install the old 6.X-rpm? Is there some build instruction for building older versions from source? I was looking on the Oracle page and they seem to be Suse 15.3/15.4 oriented. BR