So I got the patch, and my sim turned out to be away from home when I loaded. Brought her home, and she immediately got an Uncomfortable moodlet from her poorly decorated lot! After thinking about what might be so awful here, I realized that her huge greenhouse was all bare drywall- the walls are all just big windows, so I forgot all about painting the tiny edges still exposed, and the area under the roof peaks. The game saw all this wall with no paint/wallpaper/siding/whatever, so there it was!
Also took a bit to figure out how a ladder goes on, apparently your sim does not step through the handrails at the top, even though it looks like that's how it would work.