Man we are engineers....I don't think anyone of us has ever broke a law or did anything wrong! at least I know I never did, so what about this "security check"...I have been sending them emails a lot and the response is always the same: "Dear Abdelrahman, kindly note that your Visa is under issuance and we will contact you upon any updates accordingly" I am going to stop sending them emails for a while so, please guys give it a shot and email them and let us know! Also FYI, I know a Masdar graduate who told me the Visa may arrive late, and that they give you up to "one week" after the start of the semester to arrive their... this year the semester starts next Sunday 30/8.