[Ak3000]

Just to explain why I was doing what I did… I precomped and track matted my keying work so that I could perform a cascading key (pull multiple keys to target problem area like hair etc that may need a different key from the main overall matte pull), and perfrom any matte choking etc on the greenscreen shot, keeping this set of operations wholly seperate from any colour processing etc.
However, putting the keys etc in the precomp and not doing the track matte thing results in it working perfectly, so I’ll go with that. Nice one

Thankyou for your help and suggestions

Cheers!