Something apparently changed in Supersized 2 so that it no longer plays nice with Advanced CSS Animator. The showcase at www.dmxzone.com/demo/dmxAnimator/supersized/index.html uses version 1.0.1 of dmxSupersized.js (at www.dmxzone.com/demo/dmxAnimator/supersized/ScriptLibrary/dmxSupersized.js). That version gets overwritten when you update the Supersized extension to version 2.0.1.

My old Supersized pages that use CSS Animator to slide captions on and off the images were built more than a year ago by following the instructions for the showcase. After I updated to Supersized 2, the captions stopped sliding off the images and instead would remain onscreen and overwrite each other.

When I saved a copy of dmxSupersized.js from the showcase page and called that version into my pages instead of the updated one, the magic started working again.