I run my MBA 2012 hooked up to a 27" Thunderbolt display. Everything is fine. But when I hook it up to my old Dell 2312HM display (mini displayport to display port) I experience a weird color issue on some elements in the browser (like buttons) It is different from browser to browser but most noticeable in Safari. When not hooked up to the external display everything is fine. See the attached image. Can it be some sort of issue with the color profiles of both displays (built in and external) or maybe the cable? I could try to hook it up with a VGA cable and converter that I have laying around somewhere. Any suggestions?