Im using: MacBook Pro (15-inch, Mid 2010) 2,4 GHz Intel Core i5 4 GB 1067 MHz DDR3 330M SL3 DJM800 MixEmergency Version 2.7.1 (2.7.1.01) SeratoDJ Version 1.7.6. Problem has started 3 days ago. I played last 45 night with no problems then when I load video in deck B when deck A is playing I got CPU in red and then Serato indicate USB dropout and I got audio glich then CPU get back normal. And every time I load new video in deck I got that and when I making transition. When I turn off ME and using only SeratoDJ with no video output its all good. CPU is OK, no glich. It happens last 2 night and I need some idea soon. Im playing every night and now Im in problem. I was using last 45 night Mavericks, then last night I put fresh install of Yosemite but problem is still there.