Track Matte Key flickering for no apparent reason

Heya...

I'm having an issue with a track matte key that I have applied to a vignette part of my footage.

For some reason the first 75% of on clip is not using the matte but at the end it suddenly flickers on and remains on during the rest of the clips.

I have no key frames or anything applied to the clips.
I have double checked that the matte and composite is set correctly.

Anyone ever come across this and know what's going on? Would really appreciate some thoughts as this is driving me bonkers!

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Screen Shot 2014-10-29 at 10.10.41.jpgScreen Shot 2014-10-29 at 10.10.54.jpg
 
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