I've been in a group iMessage since iOS 5 came out, and this is the first time this has happened. Last night, I tried to send a rather long iMessage to the group (maybe 2-3 times the size of a normal text limit). It failed to send, and when it failed to send, it was green, not blue. My friends said they received it outside the group iMessage as an individual SMS, even though it showed up as not sent on my end. Problem is, now, I can't seem to send any iMessages to the group (green button, not blue, so sends it as an SMS to everyone individually). I can still send an iMessage to individual people. I've turned iMessage off and on again and no luck. If I delete the group conversation and straight a new group iMessage, it will let me send it, then any messages after that, it only lets me send them as an SMS! Anyone else experienced something similar? How did you resolve it?