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    Hi everyone, <br>
    <br>
    nothing dramatic but I get a warning when I start iyt:<br>
    <br>
    <address>---------------------------------------------------------------------------------------------------------------------</address>
    <address>[19:25:12] lattice:$ iyt</address>
    <address>/home/jcpassy/yt-x86_64/lib/python2.7/site-packages/matplotlib/__init__.py:908:
      UserWarning:  This call to matplotlib.use() has no effect</address>
    <address>because the the backend has already been chosen;</address>
    <address>matplotlib.use() must be called *before* pylab,
      matplotlib.pyplot,</address>
    <address>or matplotlib.backends is imported for the first time.</address>
    <address><br>
        if warn: warnings.warn(_use_error_msg)</address>
    <address><br>
      Welcome to pylab, a matplotlib-based Python environment [backend:
      agg].</address>
    <address>For more information, type 'help(pylab)'.</address>
    <address><br>
      ==================</address>
    <address>| Welcome to yt! |</address>
    <address>==================</address>
    <address>
---------------------------------------------------------------------------------------------------------------------</address>
    <br>
    I did not get this problem before I updated to the most recent
    changeset, and I reproduced the warning on two different Linux
    machines.<br>
    If anyone has an idea about how to get rid of it, please let me
    know.<br>
    <br>
    Cheers,<br>
    <br>
    JC<br>
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