I've noticed that there are times when messaging , the responses will not sync to my phone. I will send a message from the app, and think that they were not responding. But when I happen to log on to the computer at a later time/day, it isn't until then that I see responses. I thought it may have been an issue with my older phone. Since upgrading to the Moto Droid Force Z, it still happens. I've uninstalled the app from the PC, and reinstalled. Still no resolve.