To make a seamlessly looping video it helps to delete the first or last frame.  To accomplish that, one may calculate the time it takes for 1 frame and then remove that time from the time range entered when setting up the movie export parameters.  I use the attached spread sheet to assist in that time range calculation.

I wonder often if I am missing the check box that says "Generate loopable format" on the UI somewhere?  It would automatically set the time range to delete the first or last frame from the timeline.  I suppose one would have the option of which, but it really doesn't matter since the first and last frame should be identical in the motion study for this to work.

I really like the PW360 integration and the dual screen monitor support!  Having jumped from SW10 to SW12, I'm rather dazzled.