On a video of 8 minutes or so, I get the error. If I divide the video into two halves, each half renders OK. Running a recent Mac and PPro CS6. Rendering to an external drive, plenty of room. I do utilize some filters, but it plays fine, just won't export a complete version! Not my first time with this error, but it's making me crazy. Previously, I've just pulled my two halves together in a new TL but then, I can't re-edit. And they're only about 4 minutes each.