I tried what you suggested. I looked in the main FS2004 folder and did not see a Taxi2gate entry. Everything looked ok. The issue I have with the ST Lucia TLPC Scenery is this. In the summer season the grass appears normal. When I switch to any of the other three seasons the grass appears all greyed out. The only thing I could do to solve the issue was to delete the grass.bgl file so no tall grass appears.
I tried running a scan of the airport file to see if there were any duplicates but did not find any.