Wow, that sucks! That's a scary though. Hmm, it seems like, then, that every time a new rev comes out, it's time to redo all the start parts to prevent whacky things from happening downstream. I'll pass that on. That's bizarre, and kinda scary. I've had some models behave strangely in the past, but don't know if that was the issue or not. I know I've had some parts where certain features acted differently (intersected datum curves) where they were originally made back when it was the old style. I'll pass that on, thanks!