17.1 Problems

I upgraded to Resolve 17 some time ago. Finished a couple of short films. All great.
Yesterday I updated to 17.1. My CDNG plays back very stuttered. Nothing works in the colour page, no grading seems to be happening. On quitting Resolve just stay open, won't close, won't relaunch.
I just trashed 17.1, downloaded Resolve 17 again. Launched 17, edited and graded a short film, all working perfectly.
So 17.1 is just not working for me.
MacBook Pro - 15" 2017
2.9 Ghz processor
Radeon Pro 560 Graphics 4 GB
OS Catalina 10.15.6
Yesterday I updated to 17.1. My CDNG plays back very stuttered. Nothing works in the colour page, no grading seems to be happening. On quitting Resolve just stay open, won't close, won't relaunch.
I just trashed 17.1, downloaded Resolve 17 again. Launched 17, edited and graded a short film, all working perfectly.
So 17.1 is just not working for me.
MacBook Pro - 15" 2017
2.9 Ghz processor
Radeon Pro 560 Graphics 4 GB
OS Catalina 10.15.6