My wife and I both have Droid Turbos. She uses the default Message app and I use Message+ from Verizon. Up until early this week we never had any issues other than an occasional late delivery. Now she’s not receiving my message at all but I receive all of hers. If she sends out a group message and I reply to the group message she will receive it. If it’s just a message to me and I reply she won’t receive it. I did some testing and it appears to be the same the other way around (when I use Message and she uses Message+). I also did some experimenting with my son’s phone having him send us text messages (he uses Message+ from Verizon) and if our phones had Message+ set as the default we receive his messages and if we are set with Message as the default neither one of us will receive his messages if they’re just sent to just one of us but we’ll receive them if he send/replies to a group message to both of us. It appears to be the same way with Message+ and Hangouts but I only tested that on her phone with my phone on Message+.
Any suggestions?