Track Alpha Matte, Video in Shape Layer - just turns black?

Hey!

I've used Track Matte for showing videos in Shape-layers several times. I dont know why this happens now? The video in the shape layer just turns solid black? I've tried to put the selected shape layer (above the video and under "x5" layer, as seen in the video as well) but that doesnt solve the problem. Still just solid black.

Any ideas?

Br
Niklaz