I am doing the Sponsors task, and after scrolling to the bottom of the page there are no thumbnails showing it's just a blank page?

This unfortunately means there are no offers available for you at this time. Even though we said there was a Sponsor task available, unfortunately we have no way of knowing if ads will show on the other side even though they show up 95% of the time. You should try again the next day to see if they re-appear.