When using selected verts or faces in the birth surface operator and accidentally deselecting all max crashes. It also crashes if you pick the option without any selection active.
Thanks Lars I'll look into it and try to squeeze the fix into the new build I'm posting in a few minutes.
Hmm so I tried to repro this bug but was unable to get the crash to happen. Could you send your scene to support@tyflow.com?
I can confirm that this bug is no longer present in the latest build. Excellent!