My dad recently upgraded from Cubase 5 to Cubase Artist 9 and occasionally when he opens old projects from 5, some of all of the tracks will start 1/32 note early. The projects are quantized to 1/32, and there are no gaps between the beginning of the project and the tracks. I’m not sure what’s causing it and after searching around for a bit I can’t seem to find anyone with a similar problem.
If you need any more info please ask, I’m just relaying information so my account of what’s going on is probably very spotty. 
Update: it seems it’s not specific to 5 projects being open in 9–we started a project from scratch and the click suddenly got out of sync by a 32nd note when he created a midi track. It’s driving him crazy.