I've been very slow to notice, I guess, but it's really good to see the bug with internal expressions is fixed!
It used to be that "express_anger" would make the av grimace and jump up and down once per session, for instance, but it would only jump up and down like an expressionless showroom dummy after that. I gave up messing with internal expressions altogether until I noticed just now and quite by accident that the bug has been fixed.
Anyway, well done to the Lindens for fixing this fun little feature.