It just started happening today. I'm running Windows 10, all latest updates installed. All latest graphics drivers installed. Any time I click "move to topic" on a bit of dialogue, I get an instant CTD. "Creation Kit has stopped working" etc.

Master files for all the dlc are set in skyrimprefs.ini. I have no idea what's going on here. I tried reinstalling it already and it's still happening. This is kind of a big deal, because I use this feature all the time.

Update: Can confirm that it's only happening with my mod.