Hello, I have the same problem. It only happened with Flaming Cliffs 3 related aircraft. I also owned A-10C, and the module works just fine.
I've tried everything from reinstalling DCS, removing registry and saved games folder, re-activate the FC3 module, but nothing seem to fix this issue. I've also open a ticket, but without any solution yet. How's your ticket goes? Did they give you a fix yet?
Thanks