Anyway, I converted Invasion UAC 5 quite a while ago (around January-Februaryish), and it's been working just fine... up til now.
I start up a certain map like map 3 or map 6...
It's a huge HOM fest.
Another bug, I've got my monitor set to maximum resolution (1366x768) and taking screenshots wind up scewing it for reasons unknown. I can do it in games like Left 4 Dead 2 without this issue, but not in GZdoom.

Anyway, as you can see here, practically all of the walls have turned into HOMs since I upgraded to 1.5. Surprisingly, however, places like map 2 remain untouched/unharmed...
If you need the original IUAC5, you can get it here. I haven't tested the old one out yet, but I will tomorrow.