Best news ever: i found a copy of the v6.25 MSI. I installed it and my EverNote world is back in order. Even better, I clicked on Help > Check for Updates (since i now have a fallback plan) and got this: Maybe they've pulled this horrific v10 update? And by the way, what happened to v7, v8, and v9? Were they equally horrific and got pulled before the community revolted?
Based on the fact that I can't seem to get my Notes list back on top, plus all the other stuff I've read in this thread, I'm going back to a previous version. Well done, Evernote, well done.