Obfsproxy TBBs don't work on Mac OS X 10.7.4 and 10.8.1
The "OSX (10.6 & 10.7) 64-bit Obfsproxy Tor Browser Bundle" from https://www.torproject.org/projects/obfsproxy.html.en breaks on OSX 10.7.4 and 10.8.1.
Aug 29 08:55:39.582 [Warning] Our communication channel with the
managed proxy 'obfsproxy' closed. Most probably application stopped
running.
[...]
Aug 29 08:55:40.585 [Warning] We were supposed to connect to bridge
'(scrubbed)' using pluggable transport 'obfs2', but we can't find a
pluggable transport proxy supporting 'obfs2'. This can happen if
you haven't provided a ClientTransportPlugin line, or if your
pluggable transport proxy stopped running.
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