well cookies are the only mechanism to hide the resize options. there's two cookies: "resize-original" and "resize-notification". delete them both and you should see the resize controls again.
also make sure you're testing this on an image that is actually large enough to have resizing applied.
post #2293728 for example.
if you confirm that the relevant cookies are deleted and the rest of the page is rendering correctly, and you still don't see resize controls on large images then I have no other ideas than to simply use a different browser. I don't know enough about Microsoft browsers to help you beyond this