Motion Studies Solve Incorrectly.

Has anybody else had problems with SolidWorks throwing solved yellow lines of .1s in length in places where they simply shouldn't be? There is no reason, at all, for there to be any movement in some of these places, yet SolidWorks seems to think a part should just arbitrarily move over to the other side of the screen. This keeps ruining my animations.

for example, fast forward to 0:58 and watch from there: http://www.youtube.com/watch?v=Ksy-evk9JRU

SolidworksMotion Studies