@sardior
Found the problem and solution:
First, the stream is encoded. If you wish to keep compatibility don't buy from Apple, the m4p file format is encoded and cannot be used with the Strawberry Music Player. Conversion to mp3, ogg, or flak format is advised if you wish to use your iTunes music library.
Delete the file from the playlist so it won't find it and try to play it again. This is a single music file issue (though I have many m4p files) and cannot be solved until after the revolution...