Hi Michael,
Answering your questions:
No, I’m not saving incrementally but I still have the previous version in the same project, I duplicated the comp. I haven’t had the chance to re render that version, the new one just finished today at 5 am and I had to compress it before I sent it. I’ll try the old one again as soon as I get to the office.
I’m using 2014.2 on Yosemite 10.10.1 (Yosemite is a giant turd, but that’s another discussion).
The decently-timed render happened two days ago, on Wednesday, the unreasonable one started yesterday and finished this morning, it was less than 24 hours in between each.
The logo is an layered animated Illustrator file, I’ve used it extensively in the past in other projects and it never misbehaved (assuming it was the logo what caused the issue).
Nope, I didn’t turn on Ray-traced render, all my comps are on classic 3D.
Also, I turned off MP, and the render went down from 11 hours to 8, still excessive, but at least not as much. Puzzling.
Later today, I’m going to try some renders turning off layers one by one, to find the culprit, I’ll let you know what happens.
Thanks for taking the time to read this, if you can think of anything else please let me know.
Best,
David.