Hi Michael, I'm sorry for taking so long to get back to you on this (somehow this bug has fallen through the cracks).
I couldn't find anything unusual in the plugin-conf/munin-node file you attached. However, after a bit more search, this problem looks similar to [1]. Can you please check that you don't have '.' in your path? If this is not the problem, then please attach the output of $ENV{PATH} as munin-node sees it? Thanks, Tom Feiner [1] https://bugs.launchpad.net/ubuntu/+source/munin/+bug/43447
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