It appears you're going about this the hard way.
First, stabilize the footage. Trim up the in & out points. Apply the Posterize Time Effect. Mask around it. Loop it. Done.
Thanks dave, but i want full motion in the pie shaped sub frames. I don't understand why the clip is not playing within the mask.
As you can see in the raw footage,she is dancing fluidly.
I would like her to dance fluidly in each piece of the pie except have each piece of the pie be trailing frames.
I'm replying to your question on my phone so I can't look at your project but I did look at your video.
Here is what I would do to troubleshoot the project. First run a RAM preview of the pre-composed and masked wedge comp. If that plays back correctly then everything else should work unless you have applied some kind of time effect to the duplicated layers. If that doesn't work then show us a screenshot of that pre-comp with all of the properties of the movie layer revealed (Press that u key twice).
If you have not sorted this out by the time I get back the office I will try and take a look at your project.
What happens if you put the mask in the precomp? Have you purged everything?
purged all. i'll try the mask in the pre comp