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Is this an official Walkman update to the SP or a ported version you found on the net
I honestly don't know why then - Could be an update designed for the new 4.3 released 3 weeks ago or vice versa and is causing a compatibility issue
You could try performing a system repair
Ok.... Thanks For Your Suggestion....
Sorry to hear that you're having issues with the new Walkman version.
Could you please check what model number, build number and customization version you have in your phone? You can see this under Settings -> About phone. To see customization version, dial *#*#7378423#*#* and select Service info -> Software info.
Which version of Walkman is preinstalled in your phone and working? You can see this under Settings -> Apps -> All -> Walkman.