When I'm in BVR mode, I can press key 1 (for example) to switch back to NAV. Once in NAV, I can press key 1 again to turn on ILS and cycle through available airfields (if I understand correctly how this mode works...)
Anyway, that's when the freeze happens: when I press 1 again once in NAV mode.
Intel Core i7-920
GTX 560 ti 448 cores