@dunlix (and others)
Thanks, the disable plugins suggestion worked. Apparently it was the "sanitize html" plugging that was causing the problem.
Not even sure why we had that still installed.
Thanks all for the troubleshooting help!
I lost my .git file in NodeBB folder and can't upgrade NodeBB. How to return .git?
Use whichever 1.x version of NodeBB you're currently on.