WMP 12 Issue

I've searched around on this one for a couple weeks and not found anyone with a similar issue... here goes.

When I'm playing tunes in WMP12 the song I am listening to will finish and not move on to the next song. When I open WMP12, and look at the list the song just finished is displaying a red X and I get an error message basically saying the WMP can't play the song (though it just played it). If I double click the tune with the red X it then plays, the red X goes away, and I can then move on to the next song.

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