RevMob intermittent could not download fullscreen image

I found the RevMob Unity SDK easy to implement on iOS. But as I have been testing with revmob.SetTestingMode(RevMob.Test.WITH_ADS); I find it is often failing to load fullscreen ads.

The fullscreen ad is set to show at the end of a game. The first viewing during the app running fails about a third of the time. If it does show and I play a second game after dismissing it, it will fail almost all the time when I try to show another fullscreen ad (my app still keeps running when ads fail).

The failure message in Xcode is:

2013-04-14 21:08:59.146 tiltstormS[2439:907] [RevMob] Initializing Fullscreen.
2013-04-14 21:08:59.608 tiltstormS[2439:907] [RevMob] Ad received: (200).
2013-04-14 21:08:59.815 tiltstormS[2439:907] Releasing fullscreen.
2013-04-14 21:08:59.815 tiltstormS[2439:907] Error Domain=Could not download Fullscreen image. Code=-1 "The operation couldn’t be completed. (Could not download Fullscreen image. error -1.)"
2013-04-14 21:08:59.816 tiltstormS[2439:907] [RevMob] Failed with errro: {
}

Has anyone else seen this? Did you find a solution?

We are facing exact same problem in Testing mode.
Don’t know what’s going on with RevMob…

Thanks JOE1345, as I am testing it in an update to an old app, I may as well release it and see how it goes before considering RevMob for my new games coming along.

EDIT: I removed the testing mode before submission. When testing the release build, the live fullscreen ads appeared almost every time.

I’ve just ported my old Corona SDK game to Google play Store in a FREE + RevMob ads model. Not sure what to expect, the game is pretty rubbish, but I want to have a look and compare with iAd Network from Apple (what’s your opinion about, folks?).