Are you using stock messaging App? If you are using a different App for messaging...you might be getting notifications from Stock App AND other App.
You would need to turn off notifications from one of them.
You could also go into Android Wear settings on phone and Block notifications from...
I ran into same problem yesterday. The option was "greyed out" .
Fix: Just turn OFF "AUTO CONTRAST" in the settings and the exposure option will be available again. It seems like you can have one or the other set at time.
I updated with KIES yesterday. A few tweaks here and there. I believe it is just setting the S3's up for Jellybean, which is supposed to start rolling out to us after August 29th.
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