As the title states when I launch Adobe Reader it crashes on protected PDFs after enabling all features. I am on version 21.5.20048.43252 of adobe reader DC. If I run it as admin it opens no problem but this is not a feasible solution since we have hundreds of users in our organization. I was able to pinpoint the plugin in particular that is causing it to crash. It is the checkers.api plugin in c:\program files(x86)\adobe\acrobat reader DC\reader\plug_ins. Please note this did not start happening until we updated to the latest reader.
Windows 10 Pro build: 19042.1052
Latest Windows 10 update is 2021-06 so I have the most recent updates