When using an anvil (or chest or (I expect) a crafting bench and furnace etc) there is an odd text glitch, brightening and bolding the text when anywhere above the inventory hot bar.
UPDATE FOR 1.7.1: Ok, Anvil text is now fixed but in a chest the glitch has been altered strangely. When there is nothing in your inventory, the glitch still happens. When there is, it is completely fine!! See below