i've seen something similar before but i have not been able to duplicate it. it happens so rarely that i haven't investigated it too much. it usually manifests itself with a phone call once or twice a year.
them: the links on the page don't do anything
me: press f5
them: oh that did it, now they work. thank you.
i attribute it to "wonkiness" of the browser (very technical term). if it happened more, i'd probably have them view source and send me the html so i could verify that it looked okay. as always, your situation may be caused by something else, but i've had
similar problems on paypal and other high visibility sites.