Please leave your forum URL to allow us check it. Make sure you've delete all caches. And please navigate to Dashboard > Forums > Tools > Debug admin page, check database problems in Tables Tab then other errors in Errors & Issues Tab.
Robert the forum is https://www.jeannemayell.com/community/
Robert, i can also send you privately dashboard login info if that I will help but need your email info. I will work on everyone's helpful suggestions today.
So far I have gone to the debug section of the forum and under Database Problems it listed about thirty lines of problems in red. I clicked on the box that says it will solve the problems, and almost instantly the screen said that there no database problems. (maybe it fixed them?). Then I clicked on Other Errors and Issues and it also said there were no problems. (I want to tell you that I hadn't realized that wpforo had such a great set up for debugging problems.) Then I deleted the cache.
As for the patch you provided for solving the data stamp issue (thank you Verek for sending me there and thank you Robert for providing it), I will have to wait until late at night eastern time when my traffic is low to try the patch.
Could be your Autooptimize plugin, since you have some js errors (F12).