Hi Steve,
My apologies, I appear to have jumped the gun slightly here. The issue re the error message in the Data Provider has been fixed, but I have to confess that I hadn't actually tried opening the airport in the Display Unit (had assumed this would be ok).
Yes, I'm getting the same Runway assignment warning as yourself when opening EGCC in the DU and it is indeed displaying the default airport.
Sorry Urs for misleading you earlier (my time and focus at the time was taken up with various PMDG and Orbx updates today), but it appears there's still a problem here.
Thanks,
Dennis