I have a 70,000 items catalog with lots of pictures of one specific person whom I have keyworded religiously. Only about 25% of those photos show up when I click on that name in my keyword list. Is it possible to force LR to rescan all of my keywords to rebuild the Keyword list or to possibly fix whatever corruption I may have going on?
Did you click on "All Photographs" first? Did you turn off other filters and expand all stacks first?
I did all that you suggest and still have the problem.
Did you double check the keywords on the photos that the search doesn't find to make sure the expected keywords are present and spelled properly?