OP here. Update: Due to life events I've not been on LR much since I originally reported the issue in November.  After resetting LR preferences and updating to LR 12.1, I succesfully printed a few images and thought the update solved the issue. Last night, 15 Jan, I had to print a few images for a customer and realized my User Print Templates were missing due to the previous LR Preferences reset. I found/copied my backup templates and dumped them in the appropriate folder. I restarted LR, attempted to enter Page Setup and, again, the crash returned. I, frustratingly, tried several different start sequences to see if anything would fix the issue - half a dozen restarts later the problem mysteriously disappeared and I was able to enter Page Setup without the program crashing. Problem: I don't know what I changed, and in what sequence, that positively affected the outcome. Please forgive my lack of the correct technical terminology, but just a wild thought - I have three printers: Epson P800, Epson 3880 and an XP7100. The XP7100 printer is set as the default (for documents) under Printers and Scanners in my Mac's System Settings. My saved print presets (paper/ink, etc) are specifically set up for the P800. The Epson Print Driver options change when you select a different printer; I noticed that upon LR restart, the Print Settings occasionally default to the XP7100. Obviously, the saved presets for the P800 wouldn't be available for the XP7100. Could the disparity between selected printer/and saved presets be causing the Page Setup crash? Again, I know nothing about coding, if this is even possible, or if/how these variables may apply to others having the same issue.   When I get enough time I will try and troubleshoot/document each step. But, at the moment, my LR is not crashing - not holding my breath, though. I do have more to print in the next couple days, so we'll see if the issue returns.  ... View more