Rig_ui.py script file disabled for SECURITY reasons (?)

rig_ui_error

I am getting this error when I open the .blend file, both in Linux (Pop OS 19.10) and Windows 10.

I can’t help but wonder if this has something to do with the “strange behavior” I am experiencing with a file: All the 3 elements of a Physics object disappeared, but the particles are still being emitted. Problem is, I can’t modify it anymore.
I did a search for this file in the Add-ons list and not even Rigify has this file. Also nothing came up when searching the C: drive.

I wonder if anyone else has seen this error.