Unable to craft in version 1.5

Hey Mojang team, There is a bug while I am crafting. When I try to make items, it goes to the item I want to craft for about .25 of a second then disappears. Please check this issue and try to fix it. If it isn't a real bug, message me at Derekcoppola@gmail.com if its a computer issue. Thanks Mojang,

Derek J. Coppola