I had problems with many VC`s not being lit and found that the culprit was the "number of Light Sources" option on the hardware tab of the display settings window.
Dunno if this will help with the default planes but it sorted out all my addon aircraft VC`s
Thanks for the help. I igured it out. I had a reference in the panel.cfg file to a vclight fx file that I no longer had. Went back to the default file. All is good now.