Hello, i have one question, is there any posibility to remove those white lines on box border? Every box has physic behavior. Sorry for my bad english.
<img src="http://i.imgur.com/5NbVzzrl.png" border="0" />
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Make the collision box 1 pixel smaller !
Also, check your sprite image.
If you drew it small and then stretch the Sprite out to be bigger I have seen this occur as well.
Also make sure there is always a 1 pixel transparent border around every image, if your doing any scaling or zooming so you don't get ugly stuff happening. Usually pressing the crop button will do this for you.
Usually enabling Pixel Rounding and Point sampling in project properties helps fix seams.