Default Not recieving messages using hangouts

Hi everybody,
Something that I've been noticing recently that I'm not getting certain messages with hangouts. Sometimes the messages are part of a group message and other times its direct. This occurs when both android phones and iPhones text me... Something I've also noticed is that instead of getting the message I'll get something about downloading a MMS message. It then won't let me download the message.

I've attached a picture of what this message looks like...

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