Get this... Both my girlfriend and I are on iOS 6 and I have been getting notifications with light but no sound or vibration for a while, but she was having no problems; we tested to see. I decided we should log out and back in as each other (me on her phone, her on mine) and do some posting. Her phone (which had been fine) pushed notifications for my account, but only with lightno sound or vibrate. My phone (which had the problem before) treated her account the same way: light, but no sound or vibrate.
Here's what's screwed up. Now that we did this little experiment, she's suddenly having the problem on her phone with her account. And I mean immediately after trying this. We tested both phones before and hers was fine, but not any more. So either her logging in as me on her phone spread the problem to her app/phone, or me logging in as her on my phone spread the problem to her Facebook account. No way for us to tell until we find someone willing to swap one account at a time.
Here's what's screwed up. Now that we did this little experiment, she's suddenly having the problem on her phone with her account. And I mean immediately after trying this. We tested both phones before and hers was fine, but not any more. So either her logging in as me on her phone spread the problem to her app/phone, or me logging in as her on my phone spread the problem to her Facebook account. No way for us to tell until we find someone willing to swap one account at a time.