The title says it all! I've started some new characters over the last couple of days and in the course of 12 crafting quests, 5 of them have been bugged, now I would say that 5/12 getting bugged is a rather major problem!
They all have the same problem, you accept the quest from the NPC quest giver who gives you a crate with the crafting materials you need, you open the crate and receive the materials, but instead of disappearing, the crate icon 'greys out' and even if you craft the icon you can't hand it in to complete the quest, because the NPC just keeps telling you to open the damn crate! The only way I have found of clearing it is to cancel the quest and wait hours for the Master of Apprentices to offer it again!
This bug has happened to me a couple of times in the past, but 5/12 quest in the last 24 hours?