I had X3 crashing on me when working on the vs-700 jog and cursors - however, I could not reproduce it. If you can reproduce it and have a crash dump file, please use the problem reporter to report it ... maybe we get this fixed ??? this is more likely an X3 issue than vs-700 (as the firmware has not been updated, just the software receiving the signals on the other end)
BTW, there has been some work done in X3 as with X2a you got an immediate crash when you used the vs-700 edit mode plus the cursors on the vs-700 to nudge clips, this now works ... yet I don't know what the expected behaviour should be when using the jog in edit mode ...