I wouldn't label this as a bug as such, rather more of a convenience issue really, but this seems to be the best place for it all the same.
Right, the menu system. I feel it's REALLY quite slow to transit between the different submenus. It's better on this rig (and game) than Flanker 2 on a P2 450 MHz, I'll grant you that, but I can't see the least reason why this couldn't be a near instantaneous transition (like Freelancer, Falcon 4, Grim Fandango, Wing Commander: Prophecy, Freespace 1/2 . . .). Couple that with the extensive loading-times, it's... something of a turn-off. Certainly kept me away from Flanker 2.
Well, with Flaming Cliffs, the worst part is actually the loading-time and getting into a campaign, while the slow menu-switching is a mere inconvenience.