Over the past few months, I have found that several
different workbooks I use have had Auto Calculation
turned off. This is odd because I am the only person who
uses this machine and these files. I never turn Auto
Calculation off. In fact, it took me a while to figure
out how to fix it the first time. I have yet to
determine a pattern.

Has anyone else experienced this? Is it a sign of
something dire or just a little bug to be tolerated?