DaVinci Resolve 17 doesn't start

I've used Resolve 16 without problems on my Mac (Mojave 10.14.6) and wanted to upgrade to 17 Beta. Now, it doesn't start - I always get the message "The last time you opened DaVinci Resolve, it unexpectedly quit while reopening windows. Do you want to try to reopen its windows again?" (see attachment).
It doesn't matter whether I choose "Don't reopen" or "Reopen" - it crashes. I've tried de-installing and reinstalling multiple times, restarting the computer. Going back to Resolve 16 doesn't work - the same problem. Has anyone encountered this before and has found a solution?
Thanks!
It doesn't matter whether I choose "Don't reopen" or "Reopen" - it crashes. I've tried de-installing and reinstalling multiple times, restarting the computer. Going back to Resolve 16 doesn't work - the same problem. Has anyone encountered this before and has found a solution?
Thanks!