(Q) Google Now keeps reverting to an older version?

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http://forum.xda-developers.com – I've updated Google Now/Voice Search up to the latest version via the play store. Whenever I restart my phone Google Now reverts back into an older version, and Google Play tells me there's an update for it. What's going on? Thanks! Sent from my GT-I9100 using xda app-developers app (HowTos)