Clicking on the Ribbon

I have a user, who, when in Excel 2007, needs to click on some buttons twice
to make them work. This is not a "double-click" as we are used to.

For instance, when he's pasting in text and wants to convert it to "Text to
Columns", he clicks once on the button and nothing happens. He then clicks
again and it works.

On testing, he normally keeps his Ribbon Minimized. The above happens if his
ribbon is minimized, but not if the ribbon is NOT minimized.

Aside from the Text to columns button, this happens to a few other buttons.
He does not have any macros running at startup (as in AutoRun/Open, etc) and
it happens on different files.

This isn't a critical problem, but merely annoying. Thanks for any help . . .

Rich