HEllo tom,
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.
I’ll see if I can find the conflict, but the back to top button is just a really simply javascript function. No idea what NextGen is doing to cause the issue.