Ok ... I was going to bypass this old campaign/new campaign issue that was causing this problem by creating a new campaign and transferring all the data over. I went through the process by opening two sessions of FG and creating the new campaign in the second session. I named it, gave it a password and turned on all the extensions from the old campaign. When it finished loading, I opened all the modules required for the old campaign. The MM was, of course, one of these modules. My first order of business, before transferring any data (exporting and importing characters, etc.), was to test Balor! SAME ISSUE!!! AGGGGGHHHHH! Why is it doing this to MEEEEEE! It had to be me, right?! RIGHT! I wouldn't be so damn paranoid, IF everyone wasn't out to get me!
Once my fit was over, I processed the situation. I had two campaigns that I had created very recently. One worked properly, The other didn't. The new campaign I created to test the MM like Galdrin, worked. What was different?
<lightbulb> ... EXTENSIONS!
I went back to the original (old) campaign and turned off all the extensions. IT WORKED! BALOR WORKED PROPERLY!
The next question ... which one? I didn't want to think about if it was a combination of two or more. I am not that good or smart to figure that one out in a timely manner. I had quite a few extensions turned on.
I started turning them off one by one, logging in, testing Balor, logging out, rinse, repeat.
It eventually came down to the Effect Targeting Enhancement v0.3 for FG v3.1.0 5E ruleset. When I turned it off, BALOR WORKED! (I also tested it with an Erinyes) Obviously, I went to the community page to make sure I had the most updated version. I downloaded the version linked to
Comment #1. When it was turned on, Balor/Erinyes didn't work. When I turned it off, they worked.