Quick Find and the "include field..." option in the Inspector are layout specific. If you clear that check box on one layout an do a quick find on a different layout, the settings made on the other layout do not apply.
Thanks - just working on one layout. I must have lost a "created by" field somewhere on my layout because I've definitely turned off all the fields I don't want it to search but its still coming up with 100% return when I search for my name (I've created all the records). Should only be bringing up one record though.... Going to have to tear my layout apart and see if I can find a field hidden behind an object somewhere.
There was one little "created by" field hidden in the background of the layout - giving me a world of trouble!