I am seeing a major problem on one of my apps, sometimes after a chartboost ad no touches will register, you can't even click or close the ad.
Only option is to use the back button, can't release the app with this :/ and if i wait i can't publish because of the problem i posted in another thread. (insecure hostname)
you need to ask in chartboost from your account, open a ticket and sure they will point you on the steps on how to proceed with this.
... new things are coming ...