I am also having the same problem. Back to top button is not working on my site. I just purchased GP premium.
I am using it on my http://iblogdaily.com site. but it is working on my other site http://technliving.com.
One more thing is on my http://technliving.com site feature image is below the title. But when I click to open it, it looks bad and above the content area. Please Help.