Help: Animation wobbles with AntiAlias off

Hi…

when I set in Cocos Creator 1.5.1 AntiAlias off with

cc.view.enableAntiAlias( false );

my lowres pixel art animation (made with single frames and the animation Properties cc.Sprite.spriteFrame) wobbles slightly up and down. The size of each frames doesn’t change over the animation. Here are my sprite settings.

In Firefox it is fine, but on iOS the animation wobbles awfully.

Anyone knows this problem?

Thanks

Mike