How To Fix Add-On Aircraft

I cannot get the virtual cockpits of any add-on aircraft to function correctly in Flight Simulator X. All I get when I switch to the virtual cockpit view is an opaque window and all I can see are my panel instruments and HUD.
Right now I'm really frustrated and at a loss, I've re-installed FSX multiple times following the guide posted at the top of this forum. I've updated drivers and changed my settings and nothing has fixed it.
I can't get any add-ons to work correctly in FSX and I've now invested over 3 days into trying to solve this problem and have made virtually no advances.
Right now I'm really frustrated and at a loss, I've re-installed FSX multiple times following the guide posted at the top of this forum. I've updated drivers and changed my settings and nothing has fixed it.
I can't get any add-ons to work correctly in FSX and I've now invested over 3 days into trying to solve this problem and have made virtually no advances.