blank screen can't be reactivate
Guest has disabled screen. So I couldn't reactivate the screen, I've made a thread about it in the fedora forum. With the new version 2:4.2.1-1 it seems to have been resolved but it might be good to look into it. It's under fedora 32 and it was happening with ubuntu guest, xubuntu, fedora 31 and 32.
It needs further testing though