If you are updated to ICS from GB, then you NEED to do a factory reset. Backup all of your data on the phone and do a factory reset via Kies when you plug your phone in. Sometimes a factory reset is all you need to put the new OS into place on the phone. In some cases the 2 OS's clash with each other after the update and the factory reset resolves that problem and implements the new OS (ICS).
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