Continues loading pages and never shows Done Text

This could happens if your selector for the "Next" page is ambiguous, try setting something more specific.

For example, by default the selector for the Next page is "a.next", but if you have another link in your HTML with class "next" then one solution is to change the selector to something like ".pager .next":

System > Configuration > Infinite Scroll > Selectors > Next = .pager .next