The callstack you linked matches exacly with the one the was produced on my computer with UE 4.7.6.
Just to note if it can help, the crash seems to occur more often when changing the x and y axis ranges after having already placed animations then moving the graph points around again to adjust. Though I can’t guarantee it only happens in this case.
I tried provoking the crash in 4.8 and haven’t been able too up to now. I will be doing a lot of stuff with blendspaces in the coming weeks, if I come across a similar issue I will post back here.
Seb W.