The internet has exploded with people venting their frustration with iMessage after upgrading to iOS 7 (it took me over 3 days just to get it to activate), well now Apple are admitting they have a problem:
We are aware of an issue that affects a fraction of a percent of our iMessage users, and we will have a fix available in an upcoming software update. In the meantime, we encourage any users having problems to reference our troubleshooting documents or contact AppleCare to help resolve their issue. We apologize for any inconvenience this causes impacted users.
Just from my personal experience and that of my office I think it may be a little more than a fraction of a precent, bring on the update!
