CCLayerPanZoom drifts towards anchor point after pinch zoom

[doppelgangerx4]

Zooming in and zooming out both translate a CCLayerPanZoom layer and its children slightly closer to the CCLayerPanZoom's anchor point, rather than the center of each pinch. I've been able to replicate this behavior with several different CCSprites and CCTMXTiledMaps, as well as an unmodified CCLayerPanZoomTestLayer.

Set a CCLayerPanZoom's anchorPoint to (0,0), add a CCSprite to a CCLayerPanZoom, and repeatedly pinch in and out over the sprite, and the CCLayerPanZoom will drift away from the sprite, towards the lower left corner. Set the anchorPoint to (1,1) and it will drift towards the upper right.

[vaultdweller1611]

I'm having this issue too with a CCTMXTiledMap within a normal CCLayer. Just repeat zooming with the pinch gesture over and over in small steps and the view will move slowly to the left lower bottom.

Anyway, thanks for this great controller, I appreciate your work very much.