On ppc Control+G has two bindings here: "Continue search" and "Goto page". Too bad, if I want to continue current search only "Goto page" appears.
The global default for "continue search" is <F3>. I suppose you have changed the default and experience conflicts because of it or something else went wrong. You can change the global defaults via kcontrol-> regional preferences & accessibility -> shortcuts or locally for KPDF via Preferences -> configure shortcuts Not an issue here.
I see, it was only an issue for the setup "Mac-Design". "kde-standard for 3 special key" works for iBook. thanks.