I have suddenly lost the ability to playback a single camera in BI. In the past, I selected the camera I wanted to playback, went to the spot on the timeline I wanted to see and it would playback with all other cameras black. Now I repeat the same process but all of my cameras playback which uses a lot of system resources since I have 16 cameras. It will also cause the program to crash quite often. Any idea why I have lost the ability to solo playback on a single camera?