Custom Scrollbar and Multiple Frames

Within the Simple Custom Scrollbar I built, I created 3 keyframes inside the ‘contentMain’ MC. Doing this causes the scrollbar to stop working and the scrollFace disappears. I’m guessing the Scrolling function doesn’t know which frame to target? Does anyone know 1) if that’s what’s causing the breakage, and 2) if I can use frames in this manner?