I would have said it was caused by the viewports for the other items in that theme overlapping with the cover art. But I just tried it on the simulator and that theme (which seems to be minimalico for ipod nano 2nd gen?) works perfectly well for me - nothing apepars to be wrong with it, so I have no idea why you get that issue.
Does the problem only happen periodically? If so, what situation does it happen in?
Maybe it's a glitch that only appears on the current build, not on the one in the simulator?
Only thing I can see is the cover art viewport is
%V(0,0,176,132,-)%Vb(000000)
When would be better as
%V(0,0,132,132,-)%Vb(000000)
But can't tell if that matters as can't reproduce the error in the first place.