Hi, I'm on a PC.
When I work on V4 with morph brush, sometime it explodes the part the brush was used on.
I hit undo, and more explosion.  Ka boom.
I have to close P7 and restart, then I can use the morph brush no problem.
I don't use Binary Morph Target at all though.
I hope E-F. would address this bug in service patch.
I like this morph tool.  It's very useful feature of P7.