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I've seen this with my Z1 every now and then, just swipe on top of the clock widget
thanks anyway
this is a long shot but what if you restart your phone
That's a good suggestion
Safe Mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
You are welcome
glad I could help. Thanks for the kudo.