I saw something similar yesterday, and I have an NVidia card (GTX780M). I shut the game down to see if restarting it would fix the issue and noticed that my NVidia control center was showing that a new driver was available. Once I updated the driver and started the game again, the issue went away.
Of course now I don't know whether updating the drivers fixed it, or if the driver update was a red herring and I just needed to restart the game :S
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so, upgraded to latest CAT 14.20-140522a-172180E but still getting the glitch..
I have a Radeon HD XFX R7870 Core Edition and I get these artifacts too. I persume it has something to do with the FXAA but I could be wrong.
Interesting, haven't encountered those in Alpha 1.1 on the R9 280X (which anyway is a glorified 7970 Gigahertz Edition) At work can't check catalyst but as a rule of thumb, I only upgrade Catalyst when things don't work
If you think it's FXAA, you could switch it off in-game, then download RadeonPRO: http://www.radeonpro.info/ And force AA through that instead. See if that helps. Also useful for other things you want to switch on and off if there's no setting for it in-game. And if you feel masochistic, you can try and apply SweetFX to E: D![]()