Hi so I've gathered that the new Crimson Driver ( 15.11 / 15.11.1 BETA ) causes graphic artifact / corruption in Shadow of Modor.
It's actually a black patch on the top left corner of the screen. I've asked around STEAM it's been confirmed that the new Drivers are causing it.
Graphic Artifacts on AMD 15.11.1 BETA ? :: Middle-earth: Shadow of Mordor General Discussions
So just want to give a heads up and please if you do have Crimson Driver installed and Shadow of Modor, test it out and report this to AMD using the link below.