I know this is an old thread, but describes my situation exactly. It's frustrating when messages don't sync up when you want to reply or read from your PC rather than the phone or tablet. Did you ever get a satisfactory resolution to the problem?
It's important that your messages are always able to sync. I rely on this myself and I'll be happy to help get this issue resolved. Allow me to gather some more details so I can further assist you. Can you tell me more about when this first started? Are both Message+ app updated along with the program on your PC?
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