By the way, how did you install Catalyst? From the AUR or from Vi0L0's repositories?
If you did it from the AUR, you should already know all this. If you installed it from Vi0L0's repositories, I think something else is going on, and you can ignore most of what was said in this thread. Is it[1] still in your pacman.conf? If it is, also note that you should upgrade with # pacman -Syu, not # pacman -Su. Good luck, Sebastiaan [1] https://wiki.archlinux.org/index.php/Unofficial_user_repositories#catalyst
