Bug Fix Release: Shader wasn't making it to production
MMVR has apparently been broken on Steam since April 10th. I didn't notice because it was working fine on all of my test machines. Only the production builds were broken. In other words, it was only broken for everyone but me. :(
This bug was caused by the new wireframe shader. I should have caught it, but I didn't. Sorry. My fault. I'll try to make sure I test the steam builds before they go out in the future.
It's fixed now. Big thanks to Chrisbot for reporting the issue last night and making me aware of it.