Hi guys, I am new to motion studies, and I am struggling a little to get things working right.  I have a pretty basic piston pushing a disc setup.  When I setup a linear motor to push the piston, in Basic Motion, it tries to break all my constraints and stalls out.  In Animation it seems to work fine.  I am thinking it is probably an easy fix and something I am just doing wrong.  I would like to upload the files, but I do not see an option for that.  I will post a pic instead.  Thanks!