abrt version: 1.1.18
architecture: i686
cmdline: /usr/bin/python /usr/bin/picard
component: picard
executable: /usr/bin/picard
kernel: 2.6.35.14-106.fc14.i686
package: picard-0.15.1-1.fc14
reason: mainwindow.py:636:updateSelection:UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 32: ordinal not in range(128)
release: Fedora release 14 (Laughlin)
time: 1330878740
uid: 500

backtrace
-----
mainwindow.py:636:updateSelection:UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 32: ordinal not in range(128)

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/picard/ui/itemviews.py", line 160, in update_selection_0
    self.update_selection(0, 1)
  File "/usr/lib/python2.7/site-packages/picard/ui/itemviews.py", line 155, in update_selection
    self.window.updateSelection(self.selected_objects())
  File "/usr/lib/python2.7/site-packages/picard/ui/mainwindow.py", line 636, in updateSelection
    statusBar += _(" (Error: %s)") % obj.error
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 32: ordinal not in range(128)

Local variables in innermost frame:
obj: <File #513 u'04 Hidden Lakes.m4a'>
statusBar: u'/home/majhoul/Musique/Shearwater - The Golden Archipelago - 2010/04 Hidden Lakes.m4a'
self: <picard.ui.mainwindow.MainWindow object at 0x9c49ecc>
is_album: False
orig_metadata: {'album': [u'The Golden Archipelago'], 'gapless': ['0'], '~#bitrate': [256.0], 'artist': [u'Shearwater'], 'title': [u'Hidden Lakes'], 'compilation': ['0'], '~#channels': [2], 'bpm': [u'0'], 'totaltracks': ['11'], '~extension': [u'm4a'], '~format': ['MP4'], '~#sample_rate': [44100], 'encodedby': [u'iTunes 8.2.1.6, QuickTime 7.6.2'], 'tracknumber': ['4'], 'genre': [u'Unclassifiable'], '~#bits_per_sample': [16]}
objects: [<File #513 u'04 Hidden Lakes.m4a'>]
file: None
metadata: {'album': [u'The Golden Archipelago'], u'date': [u'2010'], '~#bitrate': [256.0], 'artist': [u'Shearwater'], '~#channels': [2], 'bpm': [u'0'], 'totaltracks': ['11'], '~extension': [u'm4a'], '~format': ['MP4'], '~#sample_rate': [44100], 'tracknumber': ['4'], 'gapless': ['0'], 'title': [u'Hidden Lakes'], u'genre': [u'Rock'], '~#bits_per_sample': [16]}

How to reproduce
-----
1. trying to save an m4a file with new tags. 
2.
3.