you need to copy this parameter from the search screen into the settings section for the live screen.
that is all.
Actually, the new API doesn't even have that option any more and will always exclude caches in the ignore list for every search. That "feature" (or removal) will be part of the new Geooh soon to be released.
aw nuts. GS touts the ignore list but it really screws up some stuff from time to time. it was nice to turn it off and on. sigh