Select Subject Mask Causes Entire Folder of Images to be Inaccessible, Lightroom Freezes and Crashes

To test further, I created a whole new catalog.  Imported images from a different part of my computer.  Worked fine, until I used the masking tool.  As soon as I finished masking, the whole new catalog froze up, and then shut down.  Why??

1. Make sure your antivirus is up to date, and run a complete deep scan.

Also

Right clicking on LR and selecting Run As Administrator

After you are completely sure that you have no malicious code. Logout of your computer, in fact restart your computer, then login as administrator. Just running LrC as administrator when you are logged in as standard user or (filthy dirty word) a Miscrosoft account, will not do for that diagnostic/test, You need to be logged in as administrator. (can indicate a computer user account issue).

Oh and come to think about it, that restart is important, as you need to have the computer clear out all RAM, CACHE, drivers in use, etc. (and on current Windows OS, not a shutdown, a restart is cleaner, due to Windows Fast Start)

To add to my original post: it appears that LR is now selecting random folders and making them inaccessible (freezing/shutting down).  I can't tell if these folders have Select Subject masks in them or not.  This is so frustrating.