Default Stock music player work only on S View Cover

I have a strange problem. I purchased my GN3 15 days ago. Since then I was using S View cover. 2 days ago I updated to Kitkat.via OTA. I decided to switch to normal back cover. To my astonishment it is not allowing to open the music player.
It won't work even when there is no cover at all
Anybody facing this?
Please try and let us know.
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DR. Ketan's Custom Rom KTHIRTEEN