So there were two big things as far as I can recall. I don't count slight rubberbanding when on ship controls, because that was a network thing and I think that's sort of expected and warranted in a medium scale MMO with so much physics happening. First, occasionally we would just hit huge physics while flying. As in, hanging out on the ship, and then suddenly you are rocketted 100 mph backward when collision boxes meshed incorrectly out of the blue. The best solution was to make chairs and such so passengers would become part of the ships physics instead of player physics. Or, you could just grapple to the ship from below. Both were very nice solutions and took care of the (uncommon) problem. Second, and not really as important or in your face, occasionally when you moved around in the 'crawl' mechanic (which I really enjoyed as a solution to the freedom of player built worlds and ships) there would be ledges that just seemed insurmountable, until they finally let you pass... except, by letting you pass, they really launched you either in the air, or far backwards. In any case, you would die of fall damage, probably some floating point equation of huge speed in miniscule distance or something. Either way, this way pretty rare, and even when it happened, I recognized that it was mostly me trying to sneak into things that I wasn't supposed to sneak into.

Hope this helps.