[David Dyer-bennet]

Thanks. I’ve tried that template and settings, both on my full project and on shorter bits (when I realized I was going to be experimenting to try to get it working, I of course cut down to a minimal test case). And I get the “failed to process” message from it.

Well, at least you’re confirming that the template I’m choosing isn’t an obviously stupid choice; that’s good.

Have you actually uploaded anything rendered that way to YouTube lately? And would you be willing to look at the detailed settings if I screen capture those and upload them tomorrow? See if there’s a difference at that level? It’s also possible that, since I’ve been experimenting desperately for a few days, I may have changed something early on that I haven’t found to change back.