"Yes, we have already seen this, investigated, and verified it. It only occurs on 680x0 computers, and currently we are determining if we can get a fix for it before Mac OS 8.0. The engineers say they have already fixed it in Mac OS 8.0, but no word yet on a patch before that time.
Your choices currently are to do without a RAM disk, or revert to Mac OS 7.6. The hang does occur late enough in the shutdown process that it is safe to turn off your computer."