I've started to notice some problems with server side movement.
First was a grid attached to a rotor that was horribly desynced when I logged in, it would shoot off into my base at max speed, then reset half a second later and do it again, over and over again. It was obviously a client side problem since it didn't actually do any damage, and while it was destroying my FPS/UPS the server's simspeed was still 1.0
Second, I was flying a miner (with dampeners on, thankfully) and the game locked up. When I rejoined, the ship was stopped but it kept warping around like crazy. Attempting to remote control it caused it to shoot forward at much greater than the max speed, slam into an asteroid and explode. I thought for sure it had actually been destroyed, but after perhaps 10 - 20 seconds it finally reset back to the original position, but it was still glitching out.
Logging out and back in did NOT fix it either time - they were both glitched the exact same way. However, both problems were fixed, strangely enough, by cargo ships spawning. That seemed to sync the whole world back up. So if you end up with a glitching ship, just wait a few minutes for a cargo ship I guess.
Less seriously, if you are sitting in a ship that's docked to a connector it seems to start glitching out really bad after a couple of seconds, even if connector force on both connectors is 0%. Getting out of the cockpit seems to instantly fix this so it's less annoying.
Finally, not really related to ship desync, the inventory still gets desynced sometimes - i.e. ending up with ~0.01 of something that does not actually exist, which screws up your inventory so if you move say, an iron ingot it might move a steel plate instead. Annoying because I'm pretty sure they've "fixed" this at least twice so far.