The mask property is not working correctly with the latest starling master (from github)

[ivanavdieienko]

This commit broke it Gamua/Starling-Framework@bd7a024

[sixfngers]

just add an override to the set mask function inside PixelMaskDisplayObject line 82
public override function set mask(mask:DisplayObject) : void

that worked for me

[yuhengh]

Add the override won't work when stencil buffer is turned on. (especially on web where it's always turned on) So it's better to rename it to something else (let's say pixelMask)