I do need the Komplete Kontrol driver for my MK1 controller to work though. I tried uninstalling the main core software program, but the issue still persists.
That’s bad! I just googled for “Native instruments drivers crash cubase 14” and I found another topic in this forum with the same problem:
Thing is that samueltornqvist seems to have found a solution! Read it there 
Thanks for the possible solution. I already have all these set up. I even tried switching off my Komplete Kontrol MK1 controller and quitting Cubase - the problem still persists! Argh. I’m running out of ideas.
Okay, I’ve downloaded WinDbg and analyzed my ProcDump.
It seems that the latest version of ALTIVERB 8 is the damn cause.
It seems that Altiverb 8 has trouble gracefully unloading itself and its resources when I’m closing the project.
I’m going to try to see if I can get in contact with the guys at Audio Ease and see what they say.
Have a look at this thread
I’m afraid you are not the first one having issues with Altiverb 8.
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Right. I’ve already gotten in touch with the Audio Ease guys. I’ll keep updates here as we go along.
Okay, just an update.
I downloaded and installed the latest version of Altiverb 8.2.7. The crashing problem seems to have been solved. Whenever I close the project, it goes back to the Hub, and things work fine as normal.
HOWEVER - everytime I click on buttons in Altiverb that have to do with the GUI - like enlarging, pop-up menus, etc etc, Cubase will crash INSTANTLY. So Altiverb has a GUI problem. I tried adjusting OpenGL settings in my Nvidia settings, nothing worked.
Not exactly ideal, but thankfully I don’t really need to use any of those functions. I can still load IRs just fine, adjust them, and that does not crash anything.
Kinda half-satisfied.
Damn it, spoke too soon. Altiverb 8.2.7 is still causing hangs whenever I render in place.
In fact, simply removing it from the track causes Cubase to hang.
Reverting back to 7. Enough is enough.