This post ended up confirming for me what I hoped it wasn’t the truth, so I figured I’d share so others may find a solution like I did. I was getting the dreaded Unknown Error and regretfully I have experienced it before so I knew a few of the causes, so I started with deleting clips, then moved on to trying to find the section that had errors, which proved to be a waste because the problem turned out to be all of my NESTED sequences.
In most projects to keep them clean I tend to use the nested sequence option quite regularly. I use it to help organize a design intros and lower thirds, since they typically get complicated and amass many layers. And for some clients I use the same intro and lower thirds multiple times for different videos so it is easy to drag in “intro” or “Jon Lower Third”. It also works nice if you want a clean fade or transition in/out.
So my work around for mine was to go into the nested sequences and copy all the layers I was using and then pasted them overtop of the nested sequence, being careful I didn’t overwrite anything important.
Now here is the real goofy thing about all this was I could go in and render the nested sequence no problem and for this client I have the same intro sequence on 9 videos and 8 of the 9 export and render with 0 issues. Only one makes me do this stupid re-render! WTF!
Some times I think Adobe adds these bugs because they get bored and need someone to talk too!