On April 13, 2007, Activision revealed that the issue was not a problem with the hardware, and that the guitars were "not" defective. The cause of the problem was anti-cheat protection software, and Activision released a patch on Xbox Live on April 14, 2007 to remedy it. However, this patch may have caused some unintended side effects. Starting on April 16, 2007, numerous users began reporting lockups and failures of their system after downloading and installing this patch. RedOctane stated, "We're aware of the problem and we're looking into it."