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This may sound like a lame question, but I've always wondered. When there's an update to an app, does it delete the old app completely and replace it with a completely new version or does it just update the existing installation?

Hi all. For some reason when I open the play store I cannot scroll through the apps on the first (top) row (Right to left) until I scroll down a bit then back up to the top. Once I've done this it scrolls fine across right to left. Anyone got any ideas? I've tried clearing the cache...