Were they rendered or just realtime playback the difference is a faint light green bar (above the time line,in a sequence) if it is realtime and a blue bar if it is rendered. I am not refering to the thick green bar indicating preview render this is fainter than that. And unless all the options under sequence/render all (proxy/needs render/dynamic/etc.) are set it will not render until an edit to tape. Also edit tape has to render Bars and tone, countdowns, and black if those options are selected in the mastering settings menu. hope this helps