Gmasks cropping down right side

[facenorth]

I have a project (1920x1080 10 bit 24p ProRes 422) set up on a 2015.0.2 running on new MBP (Mavericks 16GB ram 2GB Nvidia graphics). I've been precomping in CFX some shots at 2048x1536 16bit float.

I have taken some of these shots to revise at home on a new iMac (Mavericks 32GB ram 4GB Nvidia graphics)

When I load these I find that the Gmasks in the CFX are inactive down exactly a 5th 410 pixels of the right hand side. I have tried loading in a number of ways and still get the same issue. Even created a native resolution project in case that was an issue. No joy.

Any ideas?

Cheers,

Angus