Mac OS 7.6.1: RAM Disk Issue

I installed Mac OS 7.6.1 and setup a RAM disk. Now, when I try to shut the system down, the screen goes blank but the message saying it is safe to shut down the system does not appear. On systems that power on from the keyboard, they will not shut down so I have to use the button on the back of the CPU. What is wrong?
An anomaly has been found in Mac OS 7.6.1 that causes this behavior but does not affect all Macintosh models. Apple is working on a solution and it will be available in Mac OS 8. In the meantime, downgrading to Mac OS 7.6 will resolve the issue.

This freeze occurs immediately preceding the display of the shutdown message or the system powering off. At this point, it is safe to turn off the system.

This article was published in the 9 May 1997 "Information Alley".
Published Date: Feb 18, 2012