Access 2007 Quick Sort/Filter Missing

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As we all know, in Access 2007 we have this nifty little quick sort/filter
thingummy in the column headers of datasheets.

I've come across a couple of threads where people wanted to know how to get
rid of these, although no-one seemed to have an answer. However, I have the
opposite problem: on one computer at my current client's office, the little
arrow for the drop-down menu, and the associated gubbins (e.g. the filter-on
icon) are missing! And the user (the sales director) wants them back!

To explain further:

(i) The functionality is still there. If I point at the right-hand edge of
a column header where the arrow should be, the little square where the arrow
should be changes shade when it gets the focus, and clicking produces the
drop-down menu. What is missing is the image of the arrow etc.

(ii) This doesn't just affect my application. I created a new, test
database (accdb) on the affected computer, with one table and a form in
datasheet view, and the same issue is present.

The 'puter is running Win XP Pro SP2, with Access 2007 SP1.

Any suggestions gratefully received!

 

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Problem solved. The offending computer had had the DPI setting in Windows
changed to Large Size (120 dpi). Changing it back to Normal caused the
missing images to reappear.

I experimented with a couple more computers with the same result: changing
the DPI setting to Large causes the quick sort/filter button images to
disappear. Looks like yet another bug in A2007.

n.b. this was all with Win XP, I don't know about Vista.