First off, if you are an Alchemist, opening the tradeskill book by any means will crash your client since last patch. This will be fixed with thursdays patch.
This happened when we were re-arranging some of the potions for tradeskills. If you are an alchemist I'm sure you remember some of the potions would not do anything when created. These potions have been removed from the inventory and will make it back into the game at a later stage. Removing these had an unexpected effect and was unfortunately overlooked by us when patching out the latest patch. We are sorry about this.