ensemble status fails with "ERROR unhashable type: 'list' " when scope is passed

Full backtrace:

2011-07-20 14:33:42,747 ERROR Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 388, in errback
    self._startRunCallbacks(fail)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 455, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 542, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1076, in gotResult
    _inlineCallbacks(r, g, deferred)
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1020, in _inlineCallbacks
    result = g.send(result)
  File "/home/clint/src/ensemble/better-svg/ensemble/control/status.py", line 96, in status
    state = yield collect(scope, provider, client, log)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1020, in _inlineCallbacks
    result = g.send(result)
  File "/home/clint/src/ensemble/better-svg/ensemble/control/status.py", line 148, in collect
    not fnmatch(service.service_name, filter_services):
  File "/usr/lib/python2.7/fnmatch.py", line 43, in fnmatch
    return fnmatchcase(name, pat)
  File "/usr/lib/python2.7/fnmatch.py", line 74, in fnmatchcase
    if not pat in _cache:
exceptions.TypeError: unhashable type: 'list'