Animation of 360 degree rotation about Y axis through origin

[TeejT]

I want to create a 360 degree rotation of an assembly about the y axis. I have done this with the Animation Wizard. Unfortunately when I do this the origin wanders (doesn't stay at one point). However, I want the origin to stay put and have the part rotate about the y-axis through the origin.
I uploaded a simple assembly containing just one part to show what happens, because the behaviour is identical. Play the animation in "Motion Study 1" of "assembly.SLDASM" and you will see the origin wander in the XZ plane. I would like the origin to stay put so the rotation is about the y-axis through the assembly origin.
Thanks very much in advance!

 

[CorBlimeyLimey]

I don't know what the problem was, but recreating the motion with the Animation Wizard eliminated the problem.

 

[TeejT]

See attachment. The origin wanders side to side.