Strange AI behavior: planes turn invisible on the "Big E"

[expat]

I have used the Alphasim Big E for a long time in FSX SP2 with no apparent problems. Have been able to use the FS9 AFCADS also in FSX but have converted them with ADE utility to proper FSX ADE files. The problem is that the AI aircraft initially appear but then the model disappears. I see their lights, the AI is there but no model/textures show.

Have read you can try turning off aircraft shadows (didn't work) or that their may be a problem with mixing some FS9 scenery with non backward compatible FSX scenery.

Anyone else experience this or know of a solution?

Thanks and regards

expat