Here's a ~/.bzr.log excerpt for commit:

Fri 2009-06-26 01:20:18 +0200
0.012  bzr arguments: [u'commit', u'-F', u'commit_message.txt']
0.021  looking for plugins in /home/users/john/.bazaar/plugins
0.021  looking for plugins in /usr/lib/python2.6/dist-packages/bzrlib/plugins
0.063  encoding stdout as sys.stdout encoding 'UTF-8'
0.085  opening working tree '/home/web/work/veridic'
0.108  preparing to commit
[22075] 2009-06-26 01:20:19.065 INFO: Committing to: /home/web/work/veridic/
0.125  Selecting files for commit with filter []
0.147  aborting commit write group because of exception:
0.148  Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/commit.py", line 363, in commit
    self._update_builder_with_changes()
  File "/usr/lib/python2.6/dist-packages/bzrlib/commit.py", line 644, in _update_builder_with_changes
    self.work_tree, self.basis_revid, iter_changes):
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 585, in record_iter_changes
    revtrees = list(self.repository.revision_trees(self.parents))
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 2323, in revision_trees
    for inv in inventories:
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 2184, in _iter_inventories
    yield self.deserialise_inventory(revision_id, text)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 2206, in deserialise_inventory
    entry_cache=self._inventory_entry_cache)
  File "/usr/lib/python2.6/dist-packages/bzrlib/xml_serializer.py", line 75, in read_inventory_from_string
    raise errors.UnexpectedInventoryFormat(e)
UnexpectedInventoryFormat: not well-formed (invalid token): line 12, column 58
[22075] 2009-06-26 01:20:19.091 INFO: aborting commit write group: UnexpectedInventoryFormat(not well-formed (invalid token): line 12, column 58)
0.164  Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 729, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 924, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 560, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 2937, in run
    exclude=safe_relpath_files(tree, exclude))
  File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/workingtree_4.py", line 226, in commit
    result = WorkingTree3.commit(self, message, revprops, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/mutabletree.py", line 228, in commit
    *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commit.py", line 363, in commit
    self._update_builder_with_changes()
  File "/usr/lib/python2.6/dist-packages/bzrlib/commit.py", line 644, in _update_builder_with_changes
    self.work_tree, self.basis_revid, iter_changes):
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 585, in record_iter_changes
    revtrees = list(self.repository.revision_trees(self.parents))
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 2323, in revision_trees
    for inv in inventories:
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 2184, in _iter_inventories
    yield self.deserialise_inventory(revision_id, text)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 2206, in deserialise_inventory
    entry_cache=self._inventory_entry_cache)
  File "/usr/lib/python2.6/dist-packages/bzrlib/xml_serializer.py", line 75, in read_inventory_from_string
    raise errors.UnexpectedInventoryFormat(e)
UnexpectedInventoryFormat: not well-formed (invalid token): line 12, column 58

0.164  return code 3


And here my bzr info looks pretty tame and ordinary:
john@wawdev:/home/web/work/veridic$ bzr info
Standalone tree (format: pack-0.92)
Location:
  branch root: .