From what we’ve been able to tell so far from the information you provided, it seems like the crux of the issue is that somehow when these clips were initially imported, Cortex read the timecode incorrectly. But…
Also, just having the wrong timecode doesn’t explain why your renders were failiing for these clips.
We were not able to reproduce the render failures.
Hard to draw any hard conclusions here, but my guess is that perhaps something was a little funky with that drive. the connection to it,when you were first importing clips… or something…
And that this underlying issue was causing not only the timecode to be read improperly at first but also causing the files themselves not to be read properly, resulting in the frame decoding errors we see in the log excerpt on that other topic…