Sony Ericsson phone display problem “A” in a box won’t go away?

My wife left her Ericsson T630 buzz in her pocket without the keypad locked. Now there is a huge white box with the letter “a” that appears over the background wallpaper picture and covers most of the screen. We’ve tried varying the wallpaper and the theme and everything else we can reflect of. The buzz is still usable as the box goes away when dialing a number or using the menu but it always re-appears and covers the background picture.
Please, any thoughts for getting rid of this annoyance?

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