I have been battling stopping RW 8.4.1 from crashing on save under OS 10.15.1 and have made some progress. I removed ALL stack add ons and still crashes on save. The source of the crashes seem to be plug ins, specifically Formloom 4 and Collage2.
I upgraded Formloom from 4.0.11 to .12 and this seems to have stopped formloom based crashes but with Collage2 2.5.0 latest version crashes regularly. I will be removing all pages that use Collage 2.
I was somewhat puzzled that when I click Check for Updates within the Stacks library it showed all stacks up to date, however the PLUG IN Formloom was an older version. Is there an obvious way to check latest version for plug ins?