I have a problem on receiving messages from one contact so that I can't see his messages .... the problem started when I have installed (NQ Vault app) and marked this contact as a private one
after little days I've removed this contact from the private list & uninstalled the app (vault) ..

I've noticed that when I send him a message > he receives it normally but it is fastly disappeared from my conversation history


for who don't know the app >>