It has come to my attention that, for the third year running, the good old enchanter bug is still going strong. Every 5 or 10 enchants at level 3, the enchanting table will no longer respond to level 3 enchants. I'm forced to waste experience on a level 1 or 2 enchant to restore level 3 enchants. It is extremely inconvenient, as I have to fill half my inventory with junk tools that I can enchant. [That way I'm only wasting my exp instead of diamond pickaxes] It's completely random, however extremely easy to replicate, so you may have to enchant 1-4 inventories full before encountering it. Or you could potentially have it break on you first try.