Hello, I use xmonad standalone with an 3.11.2-1-ARCH kernel on an 21.5 inch iMac with the xf86video-nouveau driver (I log in using slim). For some applications I observe white flickering lines at the bottom right quadrant of the screen. If I let these windows float, the flickering still appears if I move them to the bottom right (I can only see the lines inside the window, not at the wallpaper), but it disappears if I move them more to the top left of the screen. Gnome applications like nautilus and gnome-terminal are not affected by these white lines, the wallpaper isn't either. Emacs, Okular, Firefox flicker though and I didn't try it out with other software. I am a bit at a loss, because I am not sure, how I could provide any log files or other evidence that could help me to solve the problem. Do you have any suggestions? I could provide my xmonad.hs. I noticed one other suspicious thing regarding the flickering applications: they lag 5 to 10 seconds when I start them. E.g. when I start emacs --daemon at the terminal it shows the Daemon does not run, starting emacs daemon and client. Warning: due to a long standing Gtk+ bug ... message, then it hangs for about 5 seconds. Any suggestions are highly appreciated! Cheers, Dominik