I just follow the sample project, but the same thing just happen. Actually I'm not using AdMob directly. I am using AdMob Mediation, which AdMob network is included in the mediation list.
For testing purpose, I've created a mediation placement which only have an AdMob network. Refresh rate is set to 60 seconds. The Mediation ID is used in my testing project which you can download it at here:
https://db.tt/7PYHmH5d
In the project, there're 3 ViewController, and each of them have a banner. If you navigate by VC1 --> VC2 --> VC3, you can see that 3 "receive ad" msg are received which is normally. However, if you wait for 60 seconds, you will see that 3 "receive ad" msg are newly produced due to auto-refresh, which is abnormal since only one banner is visible now (VC3), and the banners in VC2 & VC1 are not visible.
Eric Leichtenschlag於 2013年11月28日星期四UTC+8上午4時33分34秒寫道: