Rune of death - Council

I have no idea if this is the right place but here it is.

For some reason, I can't see the rune of death during the encounter. I play on max ultra, no sweefFx/Enb, and I just don't understand ..
Needless to say, it is a bit annoying to have to remember where the rune is in order not to run into it by accident.
I went to another server to take some screenshots, sorry for the weird/****ty Ui.

http://imgur.com/a/NEUnN

First screen: as you can see with the debuff ( and the green thingy on me ) the rune is here.

For the record ( or the lolz ) setting on 3D does nothing.

If any of you have an idea... You're welcome :D

Try to reinstall WotLK

****. I was afraid it would end up like that

I would start from deleting cache folder tho...