In another Mac OS 7.6.1 problem we covered here before, some shut down freezes when running Mac OS 7.6.1 were traced to the presence of a RAM disk. Apple acknowledged the problem, initially saying it was restricted to 680X0 computers. However, according to a new TIL file (also posted in the May 9 Info Alley), Apple no longer claims this restriction specifically. It also says that there will be no fix for this until Mac OS 8. "In the meantime, downgrading to Mac OS 7.6 will resolve this."
However, a reader has sent me a beta copy of a RAM Disk Fix patch that he has written. I hope to post it here soon.