Maya 2015 ART tools crash when saving or building rig

I am using Maya 2015 and I’ve been using the ART tools from UE 4.9, which have been working perfectly fine for about a year now, until yesterday when I tried rigging a new character and Maya would mysteriously crash every time I saved the file. To get around this I simply saved the bones, skeleton, and weight info using the template saves from the ART toolset but when it came time to click Build Control Rig, Maya crashes again, without any error or warning.

I’ve tried reinstalling 4.9, I’ve tried updating to the latest version of the ART tools, and even if I try to open a new project and just use the ART tools by itself with just the mannequin (no actual mesh that I’ve created) it still crashes.

Any help would be greatly appreciated!