Well, it's fixed - I love my LBS!

Turned out to be a combination of the rear derailleaur (however it's properly spelled) needing a little adjustment, and my not realizing that you can kinda microshift the front derailleur when moving to the largest or smallest cogs in the back. I missed that part of the whole "this is how you shift road bikes" lesson, I guess - oops! Felt a little silly, but now I know, and now my bike is wonderful again.

Didn't get out on a ride tonight, but we're set for the weekend!