I have installed Solus on latest VirtualBox, and I have applied all the updates. When I open Firefox and close it, it gives me white screen and the VM hangs. I have tried that on two different machines, I get the same result.
I have tested this on Solus 1.2.1 (latest) with Virtualbox 5.1.8 r111374 (latest) and it is still an issue.
The issue happens with either Firefox or Chrome. The screen goes white after closing either of them. Also, other windows cannot be placed over the content of the Chrome or Firefox windows.
Perhaps there's a dev build I can run that has this resolved?