Have a look here:
Does anyone have a quick and simple fix for this?
Basically the html escape characters are being added in the input field if the user arrows up, or down.
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Fixed!
http://jsfiddle.net/zK3Wc/32/
With the help of some googling and another S.O. Question; under the “focus” object, I added this:
Hopefully this helps anyone else that runs into this problem!
Tested in IE 7,8,9 FF, Chrome and Safari.