Not sure if this will work, but it did for me. I think that when this happened to me, I deleted my minecraft jar and then at the screen where you log in, I clicked "options" and did "force update". I'm not sure if it will work, but it's worth a try.
1. idk, but here's the definition for byrnie . byrnie-n. A coat of mail;hauberk. (jk theyre my little pony fanboys i think ) 2.NO (jk everyone likes trains!!) 3.ASH! 4.chocolate and, er, some kind of fruit. 5. idk, i don't do math. WHO NEEDS MATH ANYWAY! 6.hmmmm.. ALL OF IT! 7.CAKE >:(