Bobby, (Stab in the dark here m8)
The “glitch” you posted up, I am being a little presumptious here, but If you have no repro from others (with the same Vsts/plugs etc running) I’m gonna hazard & say that its a hiccup that probably be eradicated with a fresh install from scratch…I know this sounds a PITA, but if there are only few people receiving this, its a system specific thing, a dodgy registry entry, graphics hiccup, .dll problem, One of your vsti’s etc…It could come from anywhere, as I said if not many people are getting the blanking of the screen, I would look at a complete reformat doing the trick.
we know (Cubase/Nuendo) are built on the same core, but with the new addition of Steinberg & the NEK addon, this looks like something thats messed up in the “NEK” addon side…(they have to cripple the program to not include the Midi features, so leaving you to buy the NEK…If it was me, I would definately fresh install, then test…all Im saying is that this year alone, Ive reinstalled my O/S (hard drive failure, stupid bugs with Cubase etc) about 6 times, and every time I fresh installed the “idosyncrasies” dI have had before all disappeared, its been a good remedy for things like this and def worth a shot to you, if your stuck using ProFools… 
If its unusable…youve got nothing to lose…but a fresh CLEAN system, with the fernickety nature of Cubendo,and its dependencies on a clean registry, no conflicts etc… A Clean system install usually works wonders. 
I look at it this way, you are giving yourself the BEST shot of eradicating the glitch. overwriting previous versions of cubendo, and updating Vsts etc, many times lead to weirdness.