Sorry, but it seems "Endless" stands for "Endless Errors".

This time, event effects (those modifiers that last x turns) either... well, have no effect, either directly crash the game.

If a quest with just one option, the quest simply does not apply such effect.

In another, an event with two options, the game locks up. Gui is messed up and the quest restarts every time you click anywhere.

If you have time (and the patience I have run off), these files I believe are relevant. Paths in YellowMod are correct. Many thanks in advance.

YellowMod.xml

YellowQuests.xml

YellowEventEffects.xml

YellowEventEffectsAddDescriptors.xml

Heck. Where can I do that?

Anyway, if it's the "--enablemoddingtools" switch, I'm already aware. And the generated diagnostics file is not that deep information-wise, either.