Hi, i am one of the guys with the tradeskill/guild bank/talent frame issues; these frames are not skinned (it worked correctly for more than two years). I can temporary fix this by unchecking these frames in the skinner options, close the options menu, and reopen and recheck the frames; now it works fine until logout. I cleaned the addon folder and the skinner.lua-files with no success. I'm not exactly sure when it started, but i believe it could be 3.3.3.
And btw, thanks for your work! I really hate Blizzard's UI look ;)