I am having the same issue, except I *did* name it my username.gif...is it case sensitive? If it is, then I need to be able to re-upload it, which it won't because it says the file already exists 
http://www.pontifex2.com/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>
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