Created a simple minotaur head in GMax (basic shape comprise of sphere, two cones and a cylinder). After running the convert to obj script in the listener and using the listener Grabber to make the obj file, I have been able to reload the obj back into GMax as well as Wings but Sculptris won't take it.

I've noticed Sculptris can be very picky about what obj files it will without crashing out and I'm thinking that it has something to do with the prepping of the model before hand. 

Any ideas of what I might be doing wrong with the obj files that aren't making it into Sculptris would be greatly appreciated.

By the way, I have actually managed to get a really simple 'Tiara' model into Sculptris from GMax but don't know what I did differently other than the Tiara model being a lot smaller and simpler than the minotaur head.