Hi Kbbali,
If you are facing an immediate application deadline, then you might not have anything to worry about - as long as you get the rest of your application in on time. Business School Admissions Committees take weeks (and sometimes months) to review applications and decide who to invite to School. Since you have a copy of your Unofficial Score Report, you can list your Score on your applications (and the Unofficial Score is almost always the same as your Official Score, so the School(s) will know how you scored based on that information). If you contact each School's Admissions Department and explain your situation, then I would bet that the representatives in question would probably accept your Unofficial Score data until your formal Official Score becomes available. Thus, while you should absolutely keep in touch with GMAC to confirm that your Official Score is eventually released, you could probably apply on schedule and be fine.
GMAT assassins aren't born, they're made,
Rich