oh boy, we are right now in the middle of a huge upheaval! if you're on official viewer, you've got the new environment stuff, if you're on firestorm or other, you're probably using the old way as of, like, a week ago.

(environment has changed, hand in hand with a different workflow on texturing objects. we have PBR now in SL, so mirrors [can when set up correctly] even work now! but it only just went "live")

Allegory: Ahhh. Yeah, I have seen some talk about PBR, but didn't know it was happening. There's always talk about something, as you know lol

And I just updated my FS, haven't used official in about 6 years

FS doesn't have it out of alpha yet, it just went live in official. lighting is changing, we're getting HDRI environments generated on the fly (not always the way you want...), and another texture pipeline that uses metallic and roughness instead of environment and glossy