3DS2 lockeps?
It sounds like there's an ADI conflict — something's getting confused
after rendering when it re-reads the ADI packets. What are _all_ of the
drivers that you're using (display, rendering, VTR, etc> and what's your
save-last-image set to (perhaps this is getting confused by Stacker).
Please try using just the standard VGA display for the user interface and
you might also take Stacker out of the loop for awhile. See if you can
reproduce the problem under those circumstances.
– G