Is anyone else having trouble with limit distance mates and Motion studies?  It seems to be either flipping the distance, or applying some offset to make things stop in completely the wrong place.  In the attached assy, note how things move in SolidWorks- the plunger stops flush with the end of the barrel.  But in the Motion study, it comes completely out of the barrel and moves about an inch before stopping...  I've tried using faces of the parts, switching to planes, using an assy plane, etc- nothing helps.   Huh?

SW2010 SP2.1