Anyone else having problems with 4.2.1?

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http://forums.androidcentral.com – Well 4.2.1 for S3 has been leaked and it is the official firmware from Samsung themselves but I understand there will be bugs but this is ridiculous. I have found the messenger app doesnt work and any apps on the playstore that you can use instead of the messaging app crashes, folders are incredibly laggy when opening. My main concern is the messenger app, does anyone know a fix for this? Sent from my GT-I9300 using Tapatalk 2 (HowTos)