freded

"I've tried using Migration Tool in an attempt to correct these faults but it doesn't help."
 
Had a thought:-
 
First uninstalled the Phenom 100, after backing up any changes I had made; then run Migration Tool & select 'Enable'; then reinstall the Phenom 100; next, port over the backed up changes.
 
Now I can run the Phenom 100 in P3D v.3.3.5, a) without having transparent patches in the interior views and b) with the ability to start the engines.
 
My mistake was failing to uninstall the Phenom prior to running Migration Tool.
 
I hope all this is helpful to anyone else with a similar problem.