[Q] Where are my notifications ?!

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http://forum.xda-developers.com – Is there some sort of global parameter in the settings to disable all push notifications from just about any app ? In fact, it seems as if synchronisation is not happening anymore even though it is activated. GMail, Facebook, G+, Play Store... all of them. The only apps from which I receive notifications anymore are GOSMS and Kik messenger. I didn't freeze any new app lately in TiBU. Last week, there was an update on the market for an app call "Samsung Push Service". I wasn't receiving notifications for at least a week before the app was updated and I still do not rece (HowTos)