Submitted by bubbarush :

when im riding a mob and use the /go the mobs will only go south and east. why cant they go north or west? is it a problem for everyone or just me? and sometimes... for no reason, sometimes for being attacked.. sometimes for using fishing pole.. my animals rocket upward into space. Also... the fishing rod goes in random directions.

Fixed in this build:
http://ci.milkbowl.net/view/mung3r/job/MobRider/21/