Hi, i got this issue. When i try to unlock achievement - notifications didn't pop up, achievement got unlocked in Google Play Services just fine though. Kinda same thing happens when i log in to Services with default account, it logs in but without any visual cue (like little white box that welcomes you). Though it was showing up when i forgot to check testers list and gpg connect failed to connect. Achievements list displayed fine as well. What could be the problem?