Ironic! When I go to WebKit's bugzilla page, I fill out my information and click "login", but nothing happens. I had to go back to Safari to file this bug. :-( Note that I'm running a pre-release version of Mac OS X 10.4.9 (on a PowerBook G4), but Safari itself runs fine.
Thanks for the bug report, Ernest! I think you are probably running into Bug 13019, which was fixed in r20084. Please try a WebKit nightly build on or after this revision.
Ernest, please reopen this bug if using a WebKit nightly later than r20084 still shows this bug. Thanks! *** This bug has been marked as a duplicate of 13019 ***
Assuming you see this comment, that means it now works. :-)