[Tex/LaTex] Error when using REVTeX 4.1

errorsrevtex

I've tried to upgrade to REVTeX 4.1 but am getting compile error even with the simplest document:

\documentclass{revtex4-1}
\filelist
\begin{document}
test
\end{document}

produces:

...snip...
! LaTeX Error: Command \url already defined.
               Or name \end... illegal, see p.192 of the manual.
...snip...

Did I install improperly, or is this a bug?

EDIT (Requested file list):

 *File List*
revtex4-1.cls    2010/07/25/20:33:00 4.1r (http://publish.aps.org/revtex4/ for documentation)
  aps4-1.rtx
aps10pt4-1.rtx
textcase.sty    2004/10/07 v0.07 Text only upper/lower case changing (DPC)
     url.sty    1999/03/02  ver 1.4  Verb mode for urls, email addresses, and file names
  natbib.sty    2007/02/05 8.0 (PWD)
revsymb4-1.sty    2010/07/25/20:33:00 4.1r (http://publish.aps.org/revtex4/ for documentation)
 ***********

Best Answer

(More of a comment, but too long)

This is 'works for me' with TeX Live 2012, and I get file list

 *File List*
revtex4-1.cls    2010/07/25/20:33:00 4.1r (http://publish.aps.org/revtex4/ for 
documentation)
  aps4-1.rtx
aps10pt4-1.rtx
textcase.sty    2004/10/07 v0.07 Text only upper/lower case changing (DPC)
     url.sty    2006/04/12  ver 3.3  Verb mode for urls, etc.
  natbib.sty    2010/09/13 8.31b (PWD, AO)
revsymb4-1.sty    2010/07/25/20:33:00 4.1r (http://publish.aps.org/revtex4/ for
 documentation)

My immediate suspicion would be the version of natbib you are using.

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