So this was strange. As soon as I posted this, I closed my second table because it died.
I had been playing about 30 hands on my first cash table with no issues and it was still working. So after closing the second cash, I decided to try to open up a new second cash table. Before doing so, though, I went to PT4 and to Apps --> Hand Grabber --> Status and left that window open. The HUD worked on the second table fine this time and it actually showed in the Hand Grabber Status window as 2 open tables.
Do you need to have that Status Window open when loading tables? Not sure if it was coincidence or what happened.