I seem to vaguely recall once having a similar problem. But it's so vague I can't tell if it's a real memory or just something my brain is making up, and I don't remember if it had to do with BTC or not, though I want to say it did. If I did indeed have a problem, I know I managed to solve it. I can't remember what the solution was though...
Have you tried getting Orbiter Diagnostic from Orbithangar?