Galaxy S2, Hangouts app deletes incoming text messages Incoming SMS messages tend to get deleted immediately on my Galaxy S2. The original messages app does not cause any issues, but if I turn on hangouts it goes nits.

Edit: were talking about an unrooted galaxy s2 with the latest Samsung firmware. If I disable hangout sms feature everything is fine.  Funny thing there was a big period of time when hangouts worked flawlessly.  I guess the desire is to use hangouts for sms if possible.
There could possibly be a bug which is causing the app to Delete the latest incoming messages .


Un-install the application.
Power off and wait for 2-3mins 
Switch ON the device and install the App from the Play store 
Check for and install the latest updates for Hangouts from the play
store


Always keep your applications up to date in order to avoid some bugs like this in the future