Same issues unfortunately. And, just to be on a clear side, I'm pluggin my external monitor back and forth with PC and MBA, while closing MBA, just to make sure. For hours I'm using my Benq without any issues, in fact feels relaxing on the eyes, I plug it to MBA, wait 5 mins or so, eyes start to burn a bit, light headache, and whole nine yards. But please, do keep trying 🙂 Maybe you will be the one to solve hundreds or thousands of people's issues. I mean, it has to be software issue, otherwise it doesn't make sense from this I wrote above…