I completely understand and realize that it isn't convenient to have to uninstall and reinstall an app. On the flip side, if you are more comfortable waiting for an update with a fix, it isn't yet known when that will be, but the only other solution appears to be the uninstall/reinstall method for the time being.

If you are using a different messaging app on your phone aside from Message+ and the other person is using Message+ and you already tried to a) clear your previous conversation history, then b) attempt to start a new conversation with no success, believe it or not, uninstalling and re-installing only takes 5 short minutes or less. The choice is yours as always. 

Tina_VZW

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