After playing this with other people for a while, I noticed the checkpoints in the reservoir area weren't set up correctly. This update fixes it. No more SPB'ing yourself in 2nd place!
Turns out 1.4.5 didn't fix the crash, so I ended up going back to 1.3 and redoing the improvements again, this time avoiding whatever caused the crash (ZB crashed on me before, and this time it didn't. Hopefully that means no crash in-game).
Attempted to fix the OpenGL rendering crash with stability updates. Also tweaked a few more visual glitches.