[Banshee-List] Cover art

[bill young <gnuoyb gmail com>]

I used the command "banshee --fetch-artwork" to update my cover art. The 
process hangs after generating several messages eg:

(Banshee:5002): GLib-GObject-WARNING **: attempting to add an interface 
(AtkTable) to class 
(__gtksharp_57_Hyena_Data_Gui_Accessibility_ListViewAccessible+601+5b+5bBanshee_Collection_ArtistInfo+2c+20Banshee_Core+2c+20Version+3d2_6_0_0+2c+20Culture+3dneutral+2c+20PublicKeyToken+3dnull+5d+5d) 
after class_init

and

[Warn  07:00:51.234] Caught an exception - 
System.ArgumentOutOfRangeException: Argument is out of range.
Parameter name: index (in `mscorlib')
  at System.Collections.Generic.List`1[MusicBrainz.Release].get_Item 
(Int32 index) [0x00000] in <filename unknown>:0
  at MusicBrainz.Query`1[MusicBrainz.Release].get_Item (Int32 index) 
[0x00000] in <filename unknown>:0
  at 
MusicBrainz.Query`1+<GetEnumerator>c__Iterator1[MusicBrainz.Release].MoveNext 
() [0x00000] in <filename unknown>:0
  at 
MusicBrainz.Query`1+<Best>c__Iterator0[MusicBrainz.Release].MoveNext () 
[0x00000] in <filename unknown>:0
  at Banshee.Metadata.MusicBrainz.MusicBrainzQueryJob.Lookup () 
[0x00000] in <filename unknown>:0
  at Banshee.Metadata.MusicBrainz.MusicBrainzQueryJob.Run () [0x00000] 
in <filename unknown>:0
  at Banshee.Metadata.MetadataServiceJob.Run () [0x00000] in <filename 
unknown>:0
[Warn  07:02:00.361] Caught an exception - 
System.ArgumentOutOfRangeException: Argument is out of range.
Parameter name: index (in `mscorlib')
  at System.Collections.Generic.List`1[MusicBrainz.Release].get_Item 
(Int32 index) [0x00000] in <filename unknown>:0
  at MusicBrainz.Query`1[MusicBrainz.Release].get_Item (Int32 index) 
[0x00000] in <filename unknown>:0
  at 
MusicBrainz.Query`1+<GetEnumerator>c__Iterator1[MusicBrainz.Release].MoveNext 
() [0x00000] in <filename unknown>:0
  at 
MusicBrainz.Query`1+<Best>c__Iterator0[MusicBrainz.Release].MoveNext () 
[0x00000] in <filename unknown>:0
  at Banshee.Metadata.MusicBrainz.MusicBrainzQueryJob.Lookup () 
[0x00000] in <filename unknown>:0
  at Banshee.Metadata.MusicBrainz.MusicBrainzQueryJob.Run () [0x00000] 
in <filename unknown>:0
  at Banshee.Metadata.MetadataServiceJob.Run () [0x00000] in <filename 
unknown>:0
[Warn  07:02:44.695] Caught an exception - 
System.ArgumentOutOfRangeException: Argument is out of range.
Parameter name: index (in `mscorlib')
  at System.Collections.Generic.List`1[MusicBrainz.Release].get_Item 
(Int32 index) [0x00000] in <filename unknown>:0
  at MusicBrainz.Query`1[MusicBrainz.Release].get_Item (Int32 index) 
[0x00000] in <filename unknown>:0
  at 
MusicBrainz.Query`1+<GetEnumerator>c__Iterator1[MusicBrainz.Release].MoveNext 
() [0x00000] in <filename unknown>:0
  at 
MusicBrainz.Query`1+<Best>c__Iterator0[MusicBrainz.Release].MoveNext () 
[0x00000] in <filename unknown>:0
  at Banshee.Metadata.MusicBrainz.MusicBrainzQueryJob.Lookup () 
[0x00000] in <filename unknown>:0
  at Banshee.Metadata.MusicBrainz.MusicBrainzQueryJob.Run () [0x00000] 
in <filename unknown>:0
  at Banshee.Metadata.MetadataServiceJob.Run () [0x00000] in <filename 
unknown>:0

Additionally I am now unable to add cover art manually, the choose new 
cover art/delete this cover art options are greyed out. I have tried 
reinstalling Banshee - no difference.

Maybe I have to delete a corrupted file?  Any help appreciated.

Banshee 2.6.1
Ubuntu 13.10

Regards
Bill