If anyone can find a way to update SU and then explain it to me like I'm 5, that would be wonderful. I just tried to fix it buy giving SU some extra permissions, and accidentally threw my phone into a boot-loop when I accidentally removed all "execute" permissions from the /system folder. Oops, should have paid attention to what the hell I was doing. Oh well, easily enough fixed by flashing all the ML2 ODIN files (except bootloader) and then updating with the OTA ML2 ---> NE3 file dropped onto an SD Card.
Still, I'm just going to let it bother me so I don't have to go through all that again.