IN my scenario:
MacBook Pro had been on a while(say, at last 15 minutes). Clean boot, no other applications running, but my typical services running. No biggie.
Launch MyDMX, and IMMEDIATELY, I'm in massive slow-mo mode. Windows shows no abnormal activity. Not saying there is or isn't a leak, but it's acting more driver/hardware wonkiness. Since XP doesn't really support protected memory, a leak condition should often burn resources away.
But, the main thing is I know how to deal with it.