Tell me about your environment. Are you connected wireless? Is it to an Apple Airport base station or to another vendor's router such as linksys? Have you tried uploading files to other sites to see if the problem persists to other sites? I have seen mine hangup once or twice working from a pbook running 10.4.5 Server. Closing the window and restarting the upload resolved the issues but I see other network problems from time to time when connecting to Linksys routers that are resolved by turning my Wireless card on and off. Feel free to PM me, I'm a UNIX sysadmin and support OS X in addition to a few other flavors of UNIX.
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