If I go to a link with an anchor in it such as http://developer.apple.com/documentation/Carbon/Reference/Memory_Manager/Reference/reference.html#//apple_ref/c/func/HandToHand sometimes WebKit won't jump to the link. It seems to depend entirely on the speed of the network connection and the length of the page. So if it is in cache, the anchors usually work.
Another example (not hosted on an apple server) is http://www.unsanity.org/archives/000457.php#ICBM_Definition
almost like WebKit is trying to jump as soon as the first paint is done on a page and doesn't attempt to jump again when the page is entirely loaded. Or something
*** This bug has been marked as a duplicate of 12420 ***