The current tradeskill windows work fine, so I would check two things.
First, check under Settings -> Ignored Files. Make sure you don't have the tradeskill window on that list somehow.
Also go to Settings -> Variants -> Tradeskill window and try all three variations to see if the problem is one or all of them. This is a bit tedious because you have to start the game from the desktop each time you make a change, but it is worth checking.
-= Therendil =-
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