[Q] phone tile doesn't open

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http://forum.xda-developers.com – Unlocked TMO DVP was on 7720. Upgraded to 8107 and now when i touch the phone tile the screen goes blank for a second and then comes back to the home screen. Any ideas? Can't role back to the previous restore point on zune. Zune shows that it was updated to 8107 I can make phone calls from the people that i already have. i don't have a dials screen anymore. (HowTos)