squashed test in combobox???
 

I'm using a combobox on a worksheet (from the control toolbox, not forms) and
when I select an item from the dropdown list, the text in the combobox looks
fine until I move the focus away from the control whereupon it becomes larger
with the letters squashed together... and looks as if it is a graphic rather
than text.
When I click on the control again the text is fine... until I move the focus
away from the control again.
The same thing happens to command button text (again from the controls
toolbox).

Any idea why this is happening and how I can fix it?