Hey, too make it short I uploaded an example. You can resize the window in the bottom right corner. Some lines start jumping when u resize and that looks pretty ugly. The skin in the example skinning fla file has got hair lines too and there it works fine. I traced window position, width, height and so forth because I thought they might be in subpixels but everything looks fine.
Any ideas how to avoid this? Here is the example: http://16-bits.com/skintest/windowtest.html And I also uploaded my skin.fla file here: http://16-bits.com/skintest/my_flex_skin.fla Cheers, Max

