BuzzPCSOS Thank you for your answer. I tried a lot things... Uninstall and install of the whole Virtualbox stuff. Deleting the ~/.config/VirtualBox
. I also uninstalled the whole Solus VirtualBox packages and installed the original packages from the VirtualBox download side... Also tried to going back to the previous VirtualBox version. All with the same result. Next I' will tryout the developer snapshot, because I read a posting, that there a USB problem is solved. If that doesn't helps, then I will switch to VMWare temporary.