Tonight, I was experiencing some stuttering as one of our fields were being overrun. In order to "see" what was happening, I exited the arena, disabled VSync, and reentered the arena (I wanted to ascertain to what extent my system was being bogged down.) After several sorties in the field gun and in the shore battery, the field was taken. I was "jumped" to the lowest numbered field as you'd expect. I then moved to another field in preparation of choosing a place to fly from but remembered vsync was off, so I exited the arena to change the setting. The game crashed to desktop at that point, and had to be terminated.
I could not recreate the crash, but have not crashed to desktop since the beta test version until tonight. It might have been coincidence, but I believe that it might have been related to having VSync off.
(All FWIW).