I'll go to edit stuff in my story flow, and, quite frequently, when I click on a button to select a costume or designate an encounter to beat, it crashes. Reopening the program, deleting my character and creating a new one to test with does nothing, it still crashes every time.
The only workaround I've been able to come up with is deleting whole chunks of the story tree and starting from scratch with that area, but this only works sometimes. Otherwise I'm basically stuck with an incomplete or half-broke objective.
I think in my case the last batch of crashes was due to there being two encounters you have to fight through, but I forgot to delete the second "defeat enemies" part, which was screwing it up after I deleted both groups and replaced them with another species.
Still not sure why it was crashing when I tried to pick a costume though...