Today, users of the popular virtual-mixtape compiler, Muxtape, were greeted with a not so fitting surprise. “Muxtape will be unavailable for a brief period while we sort out a problem with the RIAA.” Over at the Muxtape Tumblr, however, a post stated, “No artists or labels have complained. The site is not closed indefinitely. Stay tuned.” The website’s future is, thus, clearly unclear, moreover clouded. However I have faith the service will renew its fine…