(Excel 2007 on Vista Business)

Anyone know why my Recent Documents list has stopped working and is empty?

I have changed the setting for the number of documents diplayed from 17 to
8, but when I take another look it is always back at 17. Also the "i"
information icon next to this box doesn't work.

I have run Office Diagnostics, which found no problems. And I don't have
TweakUI or anything similar installed.

Jeff