As far as I can tell, the new gallery features work fine with my altered CSS. The resized images display properly (resized); the full-sized images display properly (full). Plus the artist notes are still in the middle instead of off to the side. Yay. I'll leave it in there and report any problems.

Perhaps it's churlish to say so, but I'm a little disappointed that the default viewer option is for resized images - for a couple of reasons. A lot of viewers may never be aware that they have an option, and they'll always see the resized pic and may never know better. It just seems correct  for the default viewer option to be "artist preference".

But hey, that's small potatoes next to a great big juicy steak.