Turns out that texting was turned off at network somehow..customer service reallllly helped getting it all set back correctly.
There is a separate Google Messenger app that is supposed to a SMS/MMS replacement if I recall correctly. Unless you turn on text messaging on Hangouts by default, I don't believe you'll be able to send or receive through there anyway.
Are you receiving any errors messages when trying to send from Message+?
Have you attempted to clear the data/cache for that app? You can access it from Settings>Apps>All>Message+>Clear Data.
This will delete all current text messages but may fix your issue.
ok. did a hard reset and set up phone. went to open Messaging+ and got the following:
Undelivered Message. Unable to Send. and message shows as failed.