Perhaps try Netscape if you are using IE, or IE if you are using netscape or upgrade your browser. The submit/upload function uses some technology that is fairly "new" to old browser technology but was introduced a pretty long time ago, it should work pretty well on an up to date browser.(posted 8854 days ago)It is also possible that you've run into a posting problem, were no sites will post any html form. I've run into this problem sometimes using a cable router/modem. I can browse and click links just fine but when i click submit buttons I get DNS errors.
what is the error that you get when this happens?