That one thing I talked about where I don't have any clue what these angle are relative to.

[deckblad]

I still can't replicate the issue other than to say "Mirror parts, maybe, then set min-max values, then manually adjust position, and then move the mirrored parts. But this is what I'm seeing. Rotatrons and Hinges where the 0 position value moves over time.

http://cloud-4.steampowered.com/ugc/22839855466945507/875B175B84CFAD937C030A438563388FBFA4B738/

Note the tweakable context menu shows "Rotation: 0" on a 90 deg pivot where it's definitely not at the zero position.