bzr: ERROR: bzrlib.errors.TooManyConcurrentRequests: The medium 'SmartSSHClientMedium(bzr+ssh://user@server.net/)' has reached its concurrent request limit. Be sure to finish_writing and finish_reading on the currently open request.

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer/lib/explorer.py", line 1237, in _file_edited_handler
    callback()
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer/lib/explorer.py", line 1689, in do_refresh
    self.changed_view()
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer/lib/explorer.py", line 667, in changed_view
    self._wt_browser.set_tree(view.tree, view.branch)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer/lib/wt_browser.py", line 65, in set_tree
    self._browser.set_tree(tree, branch)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer/lib/wt_browser.py", line 469, in set_tree
    self._tree_viewer.set_tree(tree, branch)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer/lib/wt_browser.py", line 691, in set_tree
    treewidget.TreeWidget.set_tree(self, *args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/treewidget.py", line 1446, in set_tree
    last_revno = branch.last_revision_info()[0]
  File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 140, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/branch.py", line 970, in last_revision_info
    self._last_revision_info_cache = self._last_revision_info()
  File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 2546, in _last_revision_info
    response = self._call('Branch.last_revision_info', self._remote_path())
  File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 55, in _call
    return self._client.call(method, *args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/client.py", line 132, in call
    result, protocol = self.call_expecting_body(method, *args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/client.py", line 145, in call_expecting_body
    method, args, expect_response_body=True)
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/client.py", line 79, in _call_and_read_response
    readv_body=readv_body, body_stream=body_stream)
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/client.py", line 45, in _send_request
    protocol_version)
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/client.py", line 115, in _construct_protocol
    request = self._medium.get_request()
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/medium.py", line 711, in get_request
    return SmartClientStreamMediumRequest(self)
  File "/usr/lib/python2.6/dist-packages/bzrlib/smart/medium.py", line 969, in __init__
    raise errors.TooManyConcurrentRequests(self._medium)
TooManyConcurrentRequests: The medium 'SmartSSHClientMedium(bzr+ssh://user@server.net/)' has reached its concurrent request limit. Be sure to finish_writing and finish_reading on the currently open request.

bzr 2.2.0 on python 2.6.5 (linux2)
arguments: ['/usr/bin/bzr', 'explorer']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  bash_completion      /usr/lib/python2.6/dist-packages/bzrlib/plugins/bash_completion [2.2.0]
  bzrtools             /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [2.2.0]
  explorer             /usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer [1.1b1]
  launchpad            /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [2.2.0]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [2.2.0]
  news_merge           /usr/lib/python2.6/dist-packages/bzrlib/plugins/news_merge [2.2.0]
  qbzr                 /usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr [0.19.0]