ok, I'll take my dose of humble pie - when I searched I got no return, perhaps I was using A/P instead of AP? Having said that, the response to my ticket sent me to a KB search page rather than the actual solution - not what I'd call impressive customer service - if you know the solution is there then point it out.

Strangely enough, today I can see P3D flightplans in the request page whereas I couldn't 4 days ago. Reasonably sure that I rebooted after install. I don't expect CS to be responsible for PFPX exports, however I did and do expect them to import flightplans that are saved in P3D format by PFPX. I will take up the export to CS 777 with PFPX - I assume that the format is available from CS?

I have made the changes noted in the KB article and so far so good.