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Bert,
I you see no trees, you must have a cvx... somewhere in your active areas.
George
Sorry Bert I missed that. Yes, it is an airport background but it isn't in the ADE file. That's strange since it was obviously created by ADE.
Unfortunately Jon won't be around for a week or so but I will remind him of this when he returns.
George

Bert,
Your EDB2 ADE and BGL files are dated 19/06/2008 but your CVX file is dated 2 days earlier. Something happened between these two dates. Did you open the bgl file in ADE then save it?
There is no way to reconstitute the airport background from the CVX file, you will need to redefine the polygon in ADE.
George