Alright, I just noticed an interesting "feature" for Excel 97:

Start excel and place a combo box, put a few items in it.
Change your screen resolution
Click on the combo box a few times.. just mess around with it

If some random circumstance is fulfilled, the combo box will grow/shrink, OR the text in it will grow/shrink OR... (needless to say, the feature is very unpredictable)

Is this a known bug? How can I avoid it?