log file below
E: <sip.voidptr object at 0x037E9D58> 14:26:22 Traceback (most recent call last):
File "picard\util\thread.pyo", line 59, in run_item
File "picard\file.pyo", line 178, in _save_and_rename
File "picard\file.pyo", line 310, in _rename
File "shutil.pyo", line 299, in move
File "shutil.pyo", line 128, in copy2
File "shutil.pyo", line 83, in copyfile
IOError: [Errno 22] invalid mode ('wb') or filename: u"\\\\ENRIQUE\\Music
Louis Armstrong
Singin' n' Playin'
09 St.\u200aJames Infirmary.mp3"

As you must have already realised from the log file the track is called "09 St. James Infirmary.mp3" from Louis Armstrong's album called "Singin' n' Playin'". The full path is "\\ENRIQUE\Music\Louis Armstrong\Singin' n' Playin'\09 St. James Infirmary.mp3" and that is perfectly valid in Windows 7 (both command line and file explorer) but also perfectly valid in Linux (ENRIQUE is a Linux file server). It is clear that the filename is not parsed properly