I have also had strange interactions between Track Changes and the Equation Editor, so I avoid the Equation Editor where possible.
Once in a document you can copy it to AutoCorrect and make your own shortcut.
Then I explain how to get summation and integration, how to put one thing above another, and, finally, how to make fractions, for MS-Word. Use Fn key + NumLk keys to turn on Num Lock on laptops without the numeric keypad. No mathematics should be inserted into the text as graphics, or keyed in as text.
