A colleague sent me a document created with Microsoft Office 2007 that contains equations. On her end, the document looks fine; however, on *my* end, the equations show up with these funky characters overlaid on them:

Why do these weird characters show up, and how do I fix it? The equations appear like this in both `.doc`

and `.docx`

documents.

Additionally, when I double-click on the equations to edit them, I get a warning that the equations were created with a newer version of the equation editor, and when I close the editing window, the equations are gone completely. I *think* this might indicate a compatibility problem, but I am not sure of a solution.