I think the up arrow moves to a higher numbered selection, which is lower on the screen.

This is "fixed" with the new iDrive. I had it in my 2009 335xi, and it will be in my 2010 X5d. It won't be fun having old iDrive in one car (535i), and new in the other (X5d). The down arrow on the steering wheel will change your selection going down the list.

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*2010 X5d - Space Gray/Black Nevada/Dark Bamboo|ZPP|ZAP|ZCW|ZTP|ZRC|322|328|386|4NC|4UB|655 |6FL
~Ordered 8/27; Production began 9/28 at 12:20pm; Completed 10/7; Delivered 11/4!~
*2008 535i Black/Black - Dinan Exhaust & S2 Software
*1995 318ti Clubsport - Hellrot Red (autocross/fun car!)
Past: 2005 X3 3.0i; 2009 335xi