1) Check your .ini file - check that both Cheats and Debug Mode options are on. It's Debug Mode=1 in Program Options, and Cheats=1 in Game Options.
2) Also, check that you're not using Cyrillic/different symbols; it should be
GETYOURCHEATON:EnableCheatKeys()
- just like Simpson's guide says.
IWD NPC just adds party members and banters, that's it.
I don't think UB or Tweaks mess up with console, either - folks there may know more about your problem, though. I know that I played with select components of Tweaks(+fix component), select components of UB and IWD NPC, and had no problems, so.