We have risked a breaking change in ZIM 019 by removing scrollX() and scrollY() and replacing them with getScrollX() and getScrollY() to avoid over writing the window scrollX and scrollY properties. Thanks @Chris_S for pointing this out.
These are HTML ZIM functions, so we expect lesser used and we are hoping that within this time from the ZIM 019 launch that it will not affect apps. We usually would not take this risk, but we are wanting to proceed with a createjs update to version 2 that needs scrollX and scrollY intact.