I have a 7970 here that had the same problem, I did a factory reset on it and let it do its thing after the reboot and the quotes left.
But I also changed the locale from US ENGLISH to UK ENGLISH as well (That was accidental was only supposed to do voice mail).
But the factory reset did the trick for me, haven't seen it on other 7900 series only on the 7970.
Give it a shot it might work for you as well
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