Well, what I'd like to know what is the sequence preview playback is dependent on, a graphics card, cache. My card started working again but it's been spotty on and off. In my initial post maybe I forgot to add I had to switch to my internal cpu's hdmi port from my graphics card port. I recently did try exporting on a smart frame rate instead of 24 fps. Then I was working in that export to clear up the text frame errors. Oddly enough the clip shows more but the image playback freezes towards the end of my 13 minute project. But seems to export ok.