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