This is stupidly minor but I didn't see it posted in a quick scan: if you have a crafting (or Cube) window open and put down a copy of the item associated with that window, the window closes even if you still have another copy of the item in inventory.
We're overhauling the crafting system to use rather different assumptions, so this won't be an issue once 1.08 has it implemented. Thanks for posting about it though!
