Apologies if this is the wrong place or been reported before, I couldn't spot an area just for glitch reports on the site...
Anyway, what I found was that if you get a sprite with two or more costumes, click EDIT for any one of them, then when the paint window opens up and the current costume of the sprite switches to that costume, you can change the current costume without closing the paint window. If you then draw something and click okay, the costume replaced with your new drawing is the one you selected while the editor was open, not the one you clicked EDIT for...
*pant, pant*
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Yeah, I know about this.
And seriously, this is where bug reports go. You really haven't been outside your "save haven". XD XD
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http://scratch.mit.edu/projects/JJROCKER/1698185 I'm pretty sure this will help.

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