Yes this is quite similar to what I see (I think that I have a little more space between the two corrupted rectangles, but it's the same).
With the exception that on my dual screen setup, corruption on the bottom left corner only appears on the external screen, not on the laptop screen (but the mouse cursor bugs appears where the mouse cursor is, so it can be on any of the two screens).
I had this problem also. In my case it occurred about 10 times a day, and for a while I put up with it by running two X sessions. When :0 got corrupted, I toggled to :1 and when that corrupted I toggled back to :0.
Eventually I found that loading ati-driver-installer-8.38.7-x86.x86_64.run fixed it.