Had this same exact issue in 8.5.10 and even prior to that, any time I attempt to close Cubase after only working in a project for a few seconds it crashes when I attempt to close it.
For example I spent 2-3 hours writing a song, and I saved it and closed it. It closed absolutely fine, but I realized I rendered out just a small 8 bar section of the song, so I reopened the file, rendered out the whole thing, closed the file without saving and it crashed.
I figured I would come to General first before I make an official bug report post, maybe someone has some insight, I’ve done what people suggested to do to fix it in 8.5 to no avail, and I haven’t re-enabled any of my blacklisted plugins so I have absolutely no idea what is wrong.
Windows 10 with the AU (this happened before the Anniversary Update also back when I was still running 8.0.XX)
20 GB RAM
EVGA GTX 970 SC stock
EDIT: I’ve fixed my issue by upgrading to the latest VC++ Redistributables (https://www.microsoft.com/en-us/download/details.aspx?id=53840)