It looks like the MacroChain? macro doesn't work with 0.11b2; here is an error message from the log:
Traceback (most recent call last):
File "build/bdist.linux-i686/egg/macrochain/MacroChain.py", line 50, in render_macro
File "/usr/lib/python2.4/site-packages/Trac-0.11b2-py2.4.egg/trac/wiki/formatter.py", line 76, in
__init__
self.env = formatter.env
AttributeError: 'Environment' object has no attribute 'env'
It may be that I need to upgrade to a newer Trac version, but I suspect that the plugin itself needs to be modified.