The new firmwares that came out today have SELinux enabled and set to restrictive. This generally made SuperSU sad.
Finally received the 2013 Nexus 7 in the mail today (thanks +Jeremy Meiss). As reported by various DSLR Controller users, USB host did not work. Strangely - it does work for a small number of other users.
... vin Cernekee.
Just a maintenance update fixing 4.3 OTAs and OTA survival mode. Also a bugfix regarding environment variables that weren't copied to the daemon.
... mence very soon, starting with SuperSU !
So, before Android 4.3 came out and ruined my pre-holiday week and schedule, this is what I was working on. It's now less finished than I had hoped it would be before I leave, but it's already quite usable.
Another day another update - and unless some major issues arise, quite likely the last one until September.
There's been a lot of talk about the nosuid flag on mounts, that this prevents Android apps from executing things like su. While in the standard su setup this is certainly true, it doesn't really matter, and isn't the big reason SuperSU went daemon/proxy.
All this information is subject to change without notice. The current SuperSU at time of writing is v1.45.