IOError (errno 22) invalid argument in trace when stderr is closed

Using Bazaar Explorer, it became unresponsive. The following error was displayed in the command window:

----------------------------------------------------------
Failed to decode using utf8, falling back to latin1
Failed to decode using utf8, falling back to latin1
Error in sys.excepthook:
Traceback (most recent call last):
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\trace.py", line 306, in e
xcepthook
    type=ITEM_OR_EVENT_METHOD)
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\trace.py", line 103, in r
eport_exception
    error_type = report_exception(exc_info, err_file)
  File "bzrlib\trace.pyo", line 444, in report_exception
  File "bzrlib\trace.pyo", line 357, in log_exception_quietly
  File "bzrlib\trace.pyo", line 182, in mutter
IOError: [Errno 22] Invalid argument

Original exception was:
Traceback (most recent call last):
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 16
80, in do_full_refresh
    self.do_refresh(reopen=True)
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 16
83, in do_refresh
    self.location_viewer.refresh_current(reopen=reopen)
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\location_viewer.py",
line 174, in refresh_current
    model.reopen_location()
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\location.py", line 21
4, in reopen_location
    self.location)
  File "bzrlib\bzrdir.pyo", line 991, in open_containing_tree_branch_or_reposito
ry
  File "bzrlib\bzrdir.pyo", line 941, in _get_tree_branch
  File "bzrlib\bzrdir.pyo", line 1765, in open_workingtree
  File "bzrlib\workingtree.pyo", line 3052, in open
  File "bzrlib\workingtree_4.pyo", line 1489, in _open
  File "bzrlib\workingtree_4.pyo", line 88, in __init__
  File "bzrlib\trace.pyo", line 182, in mutter
IOError: [Errno 22] Invalid argument
----------------------------------------------------------

The last entry in .bzr.log was as follows, however I do not recall any issue with 'log' itself. It certainly did display the log window. The operation I tried to perform and noticed the crash was just a 'refresh'.

----------------------------------------------------------
Thu 2010-07-08 17:46:36 +1000
0.038 bazaar version: 2.1.1
0.038 bzr arguments: [u'qlog']
0.047 looking for plugins in C:/Users/myname/AppData/Roaming/bazaar/2.0/plugins
0.048 looking for plugins in C:/Program Files (x86)/Bazaar/plugins
0.194 encoding stdout as sys.stdout encoding 'cp850'
0.657 opening working tree 'C:/dev/Proj1/myMain'
10.006 Transferred: 0KiB (0.0K/s r:0K w:0K)
10.006 return code 0
----------------------------------------------------------

QBzr 0.18.4
bzrlib 2.1.1
PyQt 4.4.3
Qt 4.4.1
Phython 2.5.4
bzrtools 2.1.0
explorer 1.01
System: Windows 7 Pro 64bit