This is probably a skin cache issue.
Try open the skin folder and delete the cache files, they're files with the extension .wb4 and .wb64, then reapply the skin.
I made a BAT file that can do this automatically for you if you want.
1 - Download this file https://dl.dropbox.com/u/416294/Wincustomize/WB_cache_killer.zip
2 - Extract it to the WindowBlinds folder, it's inside "Public Documents\Stardock\"
3 - double click it.
This will clean the cache of all skins in a second, then reapply the skin.