I was watching a video on the new update 14w06a then at the end of the video he crouched and I saw a problem with his Minecon 2013 cape. He was in F5 #2 so not a lot of people could see the problem.. So I went on one of my singeplayer worlds and see if it did the same thing with my cape "I do have a Minecon 2013 cape" and it was doing the same thing.. The cape moves p in your head when you crouch and when you fly when you are crouched it acts like the same cape but its shoved in your head.
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Duplicate of MC-47542 (your friend/brother/etc? If so only one report needs to be made for an issue)
Also please do not mark future versions as affected, you do not have access to these versions yet!
Please do not mark unreleased versions (anything starting with "Future Version") as affected. You don't have access to them yet.