Similar issue here: pushing (and creating) a local branch a (Windows) network share.

Remarkably: Repeating the identical command a second time results in a "No new revision to push".

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Mi 2010-03-10 13:34:07 +0100
0.078  bazaar version: 2.1.0
0.078  bzr arguments: [u'push', u'--remember', u'\\\\ch01so01\\transfer\\kmeyer\\ch2bin']
0.094  looking for plugins in C:/Documents and Settings/mek/Application Data/bazaar/2.0/plugins
0.094  looking for plugins in C:/Program Files/Bazaar/plugins
0.172  encoding stdout as sys.stdout encoding 'cp850'
0.219  opening working tree 'D:/Projekte/Phonak2'
1.406  opening working tree 'D:/Projekte/Phonak2'
1.563  creating repository in file://ch01so01/transfer/kmeyer/ch2bin/.bzr/.
1.703  Using fetch logic to copy between CHKInventoryRepository('file:///D:/Projekte/Phonak2/.bzr/repository/')(<RepositoryFormat2a>) and CHKInventoryRepository('file://ch01so01/transfer/kmeyer/ch2bin/.bzr/repository/')(<RepositoryFormat2a>)
19.375  Adding the key (<bzrlib.btree_index.BTreeGraphIndex object at 0x016939D0>, 116502630, 49633798) to an LRUSizeCache failed. value 163464679 is too big to fit in a the cache with size 41943040 52428800
42.500  Adding the key (<bzrlib.btree_index.BTreeGraphIndex object at 0x016939D0>, 52331746, 22335917) to an LRUSizeCache failed. value 48816527 is too big to fit in a the cache with size 41943040 52428800
47.219  Adding the key (<bzrlib.btree_index.BTreeGraphIndex object at 0x016939D0>, 166789123, 31038245) to an LRUSizeCache failed. value 63380231 is too big to fit in a the cache with size 41943040 52428800
59.969  creating branch <bzrlib.branch.BzrBranchFormat7 object at 0x00EAFEF0> in file://ch01so01/transfer/kmeyer/ch2bin/.bzr/
60.094  opening working tree 'D:/Projekte/Phonak2'
60.188  opening working tree '//ch01so01/transfer/kmeyer/ch2bin'
94.047  Adding the key (<bzrlib.btree_index.BTreeGraphIndex object at 0x0182D150>, 56219808, 49936485) to an LRUSizeCache failed. value 164315728 is too big to fit in a the cache with size 41943040 52428800
97.281  Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 853, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1055, in run_bzr
  File "bzrlib\commands.pyo", line 661, in run_argv_aliases
  File "bzrlib\commands.pyo", line 665, in run_direct
  File "bzrlib\cleanup.pyo", line 122, in run_simple
  File "bzrlib\cleanup.pyo", line 156, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 1146, in run
  File "bzrlib\push.pyo", line 92, in _show_push_branch
  File "bzrlib\branch.pyo", line 1295, in create_clone_on_transport
  File "bzrlib\bzrdir.pyo", line 287, in clone_on_transport
  File "bzrlib\decorators.pyo", line 140, in read_locked
  File "bzrlib\workingtree.pyo", line 579, in clone
  File "bzrlib\bzrdir.pyo", line 1616, in create_workingtree
  File "bzrlib\workingtree_4.pyo", line 1462, in initialize
  File "bzrlib\transform.pyo", line 2253, in build_tree
  File "bzrlib\transform.pyo", line 2346, in _build_tree
  File "bzrlib\transform.pyo", line 2417, in _create_files
  File "bzrlib\transform.pyo", line 1198, in create_file
IOError: [Errno 22] Invalid argument

97.281  Transferred: 0KiB (0.0K/s r:0K w:0K)
97.281  return code 3