So I've been developing a quest for some time now, and yesterday all normal dialogue and all quest markers stopped working.

There is a forcegreet in the quest that works fine, but all other normal dialogue will not initiate. I've checked the following things:

That the quest is at the right stage
That the dialogue is conditioned correctly with both ID and QuestStage
I have quick loaded and quick saved
I have saved and loaded
I have generated new SEQ files before testing dialogue
I have checked all the different stages and different actors
I have made test actors and assigned new dialogue to them, that did not work either

My scripts still work fine, but no quest markers or dialogue works. It did however use to work, but I can't think of anything I could have done to make such a dramatic change as this happen.
If anyone has had any experience with a similar issue before I'd love to hear from you. Or if you have an avenue of approach that I have not thought about before, that'd also be very much appreciated.