When I go to Google Play Store, it says it needs background data. After I've synced everything, it still doesn't work. What should I do?
I also did a FORCE STOP for the Play Store and it reset... seems to work just fine now. Thanks for the tip!
Background data means Data Connection or Wireless connection. You should activate one of this feature in order to use the SYNC feature as it's required to access the Internet to sync items. You can enable this option from the Wireless section in Settings menu.