Scrollbar bouncing off the bottom of the range - Solved
I'm not using variable height rows but was still seeing the scrollbar bounce off the bottom of the range in Chrome. Setting variableRowHeight: true on verticalScroller fixed it, but I still wanted to know why that was needed with my fixed height rows. It turns out I had Chrome's Zoom set to 110%, and I'm sure that caused some rows to have heights a pixel or so taller than others. When I reset that to 100% I found I could remove the variableRowHeight setting and it still worked.
Hopefully this helps somebody as this was driving me nuts.