@xangold I found the issue with IE.
SCRIPT5007: Unable to get property ‘constructor’ of undefined or null reference
global-82b4bb5c90aaf0b850e2e3c4511b76aa.js, line 24 character 16892
JQMIGRATE: Logging is active
JQMIGRATE: jQuery.browser is deprecated
SEC7118: XMLHttpRequest for http://api.mixpanel.com/track/?data=eyJldmVudCI6ICJtcF9wYWdlX3ZpZXciLCJwcm9wZXJ0aWVzIjogeyIkb3MiOiAiV2luZG93cyIsIiRicm93c2VyIjogIkludGVybmV0IEV4cGxvcmVyIiwiJHNjcmVlbl9oZWlnaHQiOiAxMDgwLCIkc2NyZWVuX3dpZHRoIjogNTc2MCwibXBfbGliIjogIndlYiIsImRpc3RpbmN0X2lkIjogIjE0NmE3YzgxZTc3NDkxLTBjOGFjOGNiYmRkYzctNDIyMjA2NGEtNWVlYzAwLTE0NmE3YzgxZTc4NWNlIiwiJGluaXRpYWxfcmVmZXJyZXIiOiAiJGRpcmVjdCIsIiRpbml0aWFsX3JlZmVycmluZ19kb21haW4iOiAiJGRpcmVjdCIsIm1wX3BhZ2UiOiAiaHR0cDovL3d3dy50d2l0Y2gudHYva25vb2Jlci9jaGF0IiwibXBfYnJvd3NlciI6ICJJbnRlcm5ldCBFeHBsb3JlciIsIm1wX3BsYXRmb3JtIjogIldpbmRvd3MiLCJ0b2tlbiI6ICI4MDk1NzY0Njg1NzIxMzRmOTA5ZGZmYTZiZDBkY2ZjZiJ9fQ%3D%3D&ip=1&_=1402974248569 required Cross Origin Resource Sharing (CORS).
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