Reality GTN750 - Import Fails

Hi

Been using P2ATC for some time and works with the Reality GTN750 installed in the AFL King Air 350 aircraft. Updated to Pilot2ATC version 3 this week and working through the implementation... However, when using the RealityGTN750 in the sim to import a flight plan it ..."Fails to import!".  The set up is per manual with the correct folder C:\ProgramData\Garmin\Trainers\Databases\FPLN that show the list of .gfp flight plans saved from Pilot2ATC and Simbrief, validated correctly and also a copy of the sample .GFP file from the  \GtnTrainer\flightplan.zip. Interestingly the sample .gfp file does open in the GTN750, but none of the other .gfp files will load - showing the error "Import Failure". I have used the sim in NON-Admin mode as per some recommendations on the web - no change. I've uninstalled and re installed the Reality software - no change.

I did have one instance that did load! but that showed errors " No standard Airways" and the other "incorrect waypoints". I am wondering if there is a problem with the databases as the Reality GTN is the original version unchanged and of course P2ATC and Simbrief use UpToDate air packs from Navigraph. 

I'm at a loss why the Sim Reality GTN750 isn't loading .GFP files... it a mystery! 

I have read widely on the web forums about this Issue... I fear I'm not alone.. but cannot seen a resolution as yet....Can you advise?

Truly frustrated! 😞 your help would be truly appreciated...

Thanks in anticipation

Nik

Systems info

My Sim is a home build Flight deck for the AFL King Air 350 with Master last gen  i7 with GTX1070, 32GB mem - External View Intel i5 with Rx6700XT, 32GB Mem running three 32" screens all on XP12 12.4.1  with Air Manager 5.0, Piot2ATC, etc etc.