I built a windmill using the rotation chassis and for some reason when I leave the area and then re-enter, the chassis stops moving. Not sure if it's a visual thing, because all the shafts and machines attached seem to still be working. I just have to keep resetting the system and it returns to normal.

I noticed this too. it was a shock because i was forced to climb up to the top of my tower to restart it. for sure a bug.

Just noticed.. it's not a visual glitch. When I reload the world or unload the chunks, the rotational chassis stops working along with all my machines connected. Just need to reset the system. Waterwheels work fine.

This issue has been addressed in 0.2.2a. Thanks for the report and feel free to re-open if need be.