I have a Samsung P-605v with Android 5.1.1. Message plus has been synced to my phone for several years and worked great. After updating the app last night, Message plus quit receiving text messages. All other data apps (email, etc.) work great.
I rebooted the tablet. Didn't help.
I disconnected the tablet from the phone number. It wouldn't allow me to reconnect.
I set the app back to factory settings. It wouldn't allow me to reconnect.
I reinstalled the app. It still wouldn't allow me to reconnect.
I'm out of ideas.