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I bought it last night for the P3D v3.0 I did re-installed it again. However, I was able to remove the external GPU last night w/o issues by going to Data>Services> etc..and went away as it should.
So far, no clue why is doing that.
Try the following:
I was having problems choosing one of the default aircraft such as the Maule. Choosing a different default aircraft (Cessna copied from FSX, using P3d now) solved my issues.
Also make sure you install Q400 as administrator, open P3d as administrator as well.
Gracias Francisco. I'll try it tonight.
I've always installed and run everything with Admin rights.