Playing. I have not simmed any of my games (I'm about halfway through my first season).
The Dunleavy injury happened before the last patch, and Hinrich might have, too. But the 4-6 week ankle injury to Tony Snell was definitely after the patch, and I think I one or two of the more minor injuries also happened after the last patch.
I don't know if I have seen an opposing player get injured since the patch. I also don't know if you can tell if an opposing player just gets hurt, as there isn't any notification of that during the game unless its serious enough that they are out.