Thank you Umberto.
I completed the following based on your link:
I have scenery as top priority, ran the airport scanner and came up clean and did a search on the fsx folder for duplicate AFCAD for KLAX, no duplicate. I have also unchecked MyTraffic v6.0 from the scenery library and restart FSX. The gates are still missing in both KJFK and KLAX. Do you have any other thoughts? Many thanks.