Equation Editor overlapping symbols after edit
 

I am trying to display an equation with units (like "lb/ft") in Excel. When
I first type it in using equation editor, it looks fine. But if I go back
in to edit the equation and click back out, the equation then looks garbled
with letters and symbols overlapping each other. The font looks bigger and
bolder too. I am using Win XP Pro SP2 and Office 2003. Has anyone else
experienced this?