ACHIEVEMENT UNLOCKED – Thread Hijack 101 (Sorry!)
Totyo >> I run into problems when I delete one part of a model and then combine it back together with a different model. IE deleting a hand, and replacing it with another (same shape, just detached for topology edits). Sometimes, depending on the model, subdivision gets deleted on return to Zbrush, other times the model explodes.
Paul >> On simple extrudes and adding “outwards” to the model (plus Normal direction) on models, adjusting the projection distance works great. Cheers!
I can’t remember seeing it in the documentation or online, but there has to be a list of things that work and don’t work with GoZ. Being a Windows user I’m a little late to the party 
Thanks for the airtime furyranger!