Discovered that earlier, starting character on Hard++, and activating the trainer after starting. Trainer works fine if you activate it before starting loading a character though :P
The trainer worked fine until I completed the Healing skill quest. Now, the game turns your Pets against you. And Super Damage is enabled on the attacks against you. No Damage doesn't protect you. I've also noticed the negative XP thing.
no idea about any quests starting any bizarre or new code/attacks, etc.
I don't plan on playing this game for 20 hours searching for every quest or possibility that might make the trainer defunct.
use the trainer to boost your character to super human stats and just leave the options that don't work with your specific mission that is unusual or whatever..
firewall and other security software.
on trainer and game.
version and distribution.