If anyone can do me a favor, if you're near the Telos Underground base...
Can you check after activating the reactor what the Tank Droid does. Just go to the control center, he can't detect you there. Then see if he does patrol properly, or not...
EDIT:
Nvm, forgot I got an untampered 1.8.2 installation around too, and tested it with that one. His patrol worked just fine, when I thought the .MOD had ruined it. So I spend time trying to resolve and test a non-issue. Yay me