iMessage is confused green vs blue
I have an iPhone 5 and recently upgraded to iOS 8.0.2.
I have some group conversations with iPhone users that are now forcing me to send Green messages. I have the same people in other groups conversations where Blue messages are being sent. In all cases, the people involved are using iMessage enabled devices. It's just certain combinations of people that are causing messages to go Green. And it's just my messages that are Green. They are sending me iMessages.
Example (all people are using iPhones)
Group conversations with me and people 1,2,3 produces green messages
Group conversations with me and people 1,3 produces blue messages.
Group conversations with me and people 1,2 produces blue messages
Turning the "Send SMS Messages" button off in Settings as no effect. Still Green.
Any ideas?
iPhone 5, Windows 7