It's been a tradegy and a waste of time since updated to ver15. Short film project now the lumetri color effects are different and did'nt applied the effects over tiff frames. The new captions utilities needs to improve managing the styling. What a nightmare, rolling back to ver14.9 now.
This is the norm when there's a major update. There is no way that Adobe can test every possible configuration of hardware and operating system (not to mention peripherals and other software people have loaded). Avid back in the day controlled hardware and software and there were still issues when there was an update... Never delete the previous version when you do a major update and test the waters carefully before moving current projects to the updated version. That's just the way it is and always has been.
Sorry you had negative results, Boogietek. Thanks for the report, though. I'll let the powers that be know. Speaking as an editor, I'd say any mission critical projects onhand probably should not be migrated as a general rule of thumb. If you have any specific bugs you'd like to file, let the devs know here: https://adobe-video.uservoice.com/forums/911233-premiere-pro
Hopefully, we can get a version prepped that will work better for you ASAP.