Used FS2Crew for the 777 in FSX with no issues, just brought the P3D v4 today and have been having an issue where the FO will set the Captains display switch from MFD to NAV before bringing up the checklist. This is an issue because it means that when the FO tries to display the flight controls page it will not display on the captains NAV like it did in FSX, it's just kind of a nuisance as it means I either have to constantly switch the display back to MFD after each checklist or put up with it and not use the ND as a MFD. I have found a thread saying this is to ensure the checklist is displayed but how can it work in FSX but how can it cause an issue. 

The P3D V4 version had some differences from the FSX version (ask PMDG for the details), and this one of the items that we had to account for.

Best,