well, it's kinda hard to explain, I'll try to be clear:
I was testing toned-down ships for a new mod (low graphics, few weapons, new AI...)
and in the middle of a large-scale battle (some 10 vs 10), the game just lagged up for a second, then it freezed. the graphics looked like a screenshot, but I could still hear the battle going on (torpedo hits, phasers, explosions, even the "simulated enemy ship...." sequence played normally.)
I was forced to close BC from the task manager, and that gave me a D3D error when I restarted.
the only solution was to reset my PC, and try again. then, in a 2 vs 2 battle, it happened again. the D3D error again, and all that stuff.
the only thing I think that might have affected it is using 44khz sounds instead of 22khz for pulse weapons (too many sounds at a time. and too many pulse-based ships in one battle)
so, not finding any rational causes for it, I ask you: WTF? :?