I had the same begin a few months back Mike. I came to the conclusion that it is purposely being done by ihub in order to drive members into paying for the monthly subscriptions. I may be wrong, but I've heard the same from many others. So I become a paying member again because it was very annoying to see the ads hiding so many portions of a message.
I had the same problem a few months ago. Click on the flag in the right hand corner. You will see options. Click on "This ad is inappropriate" Do this every time the ad pops up. It should go away after you do that several times. Good luck.