System "crash" when adding a song

[FinFin]

Occasionally, my whole system "crashes" when I want to drag a new song to the playlist. The music continues to play, till the end of the song. Then it stops. I can move the cursor, but when I click anywhere nothing happens. The cursor is the hand with the + all the time.
The last terminal message at this moment is: "SOListBox::GetSelectedTracks <-1"
It happens with very different songs. But not all the time I add this song, so its not the broken song.

Any help?
THX

[anonbeat]

Please can you do a backtrace ?
viewtopic.php?f=3&t=468

Thanks for your help