Please first try to switch between the DX9 and DX11 version of the game, maybe one works better for you.
If even the desktop viewer doesn’t work, there might be something more serious going on though, almost certainly a conflict between some other program on your PC and vorpX. Likely candidates besides virus scanners are: any sort of CPU/GPU utilities, game video recording/streaming software, chat programs and generally everything that can show notifictations in games.
Best way to trouble shoot is to disable/uninstall every background program that would not be there after a fresh, Microsoft only Windows install.
If you can’t solve the issue this way, please try to start a few games, then create a trouble shoot data archive in the vorpX config app and send me this archive. I will then check whether I can find something that you may have overlooked.