Go into the settings for the messaging app and enable "preview message". That will fix your problem. As for the box, it's the box in which you must swipe to unlock. When you press the message, the box will pop up, swipe on the box, and then continue to the message. Hope it helped!
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-Samsung Galaxy S4 Black Mist AT&T (SGH-i337) STOCK 4.4.2 (NB1)
-Samsung Galaxy S3 Marble White AT&T (SGH-i747) (CM10.1.0) (Currently dead)