Word 2013 has a great feature for reviewing and editing documents. Rather than having to see every edit that was made to a document, you can enable viewing "Simple Markup," which simply shows a line in the margin indicating a change has been made.
Unfortunately, this new option seems to be slippery. When I set it to Simple Markup while working on a document, every few minutes and for no apparent reason it will switch on its own to "All Markup." It seems to occur only when the document is out of focus, meaning I'm working in another window.
How can I get Word 2013 to keep my selection for markup viewing?