IE <select> pop-up size determination?

Been around the entire office, and found no rhyme or reason to this:

Have a select box with 21 options in it.  When 75% of us click it we're
shown 11 options and a scrollbar.  The other 25% get the full 21options with
no scrollbar.  There's a mixture of w2k and wxp, but no correlation.  All
checked in IE6, and all machines are updated regularly.  I have exactly the
same version of IE (6.0.29000.2180.xpsp_sp2_gdr.050301-1519) that a
colleague has, yet we get the opposite behaviour.  We're both running
1024x768.  The only thing that links those who get the full 21options with
no scrollbar that I've noticed so far is that they're both on laptops...


any clues?



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