Hi Nick, I have been having trouble with my video hanging up ever since i upgraded to the last three versions. Half of the video from one side or the other will stay on the output after a transition between tracks. Its seems like it happens sooner when i apply video effects from my presets, but it also happens eventually even when i don't use the effects. I have to close and reopen ME to get it working again. I am currently using ME 2.6.1.01 with Scratch live 2.5.0 with a Rane 62 and turntables. I have also experienced this when i tried using it with Serato DJ and a pioneer controller. I have tried several times to remove Scratch Live and ME and install them fresh, but i keep getting this problem. Its causing me to have to fallback to Serato video. Here are my macbook specs Processor 2.6 GHz Intel Core i7, 8 GB 1600 MHz DDR3, NVIDIA GeForce GT 650M 1024 MB, OS X 10.9 (13A603). Any ideas?