F4 key does not toggle relative/absolute cell references.

I am using Office 2003 SP3, and am also using the Microsoft Natural Keyboard
Elite (which may be the problem). Using my F4 key to toggle between relative
and absolute cell references does not toggle as expected; in fact there is no
toggling performed. I had no trouble with a standard keyboard, but when I
switched to the Microsoft Natural Keyboard, the F4 key no longer works as
expect.

Is anyone aware of a fix for this problem
.

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