Previously reported by above - I’m also getting such crashy behavior with ART and Maya 2015.
I can confirm that saving the project will always crash the Maya instance and that the file is damaged - when it will open I have objects missing.
Even before getting to that point, I’m unable to build the control rig. I let ART build the default skeleton, create the reference pose, and take the defaults for the proxy mesh. All without my touching or moving any joints. The segmented mesh that then appears has some problems. The right arm and hand, the right thigh and the right foot all take on a different appearance from the rest of the segments. If this is some indication of a mirroring mode then the normally appearing right lower leg is the oddity. It should also be noted that the mesh for the right clavicle is nearly invisible. I believe the meshes on the right-side limbs are 100% transparent when viewed from some angles and most of what appears is internal shadowing.
Without changing any weights / influences, the Build Control Rig button causes the Publish Character screen to appear. I can name the character and press build to see the thumbnail camera screen. Pressing the camera button to record the thumbnail causes an instant Maya crash. Or the camera dialog closes, the Maya UI will be locked up for 15 seconds or more, and then it will crash.
Efforts to save my scene progress prior to this known crash point will simply result in a crash. ART looks really useful - I’m hoping to make more progress with it but am completely stuck at the moment.