So I finally installed, played and modded Skyrim for the PC, and it runs very smoothly. Huzzah!

There's one issue though. Trees in the distance seem to flash, disapearing and reappearing in seconds. Mountains also flicker; though I believe that is a seperate Z-fighting issue. My main issue is with the trees, as it really ruins the immersion.
I captured a short video to show you what I mean: http://www.youtube.com/watch?v=hbsQRmc1Yvs
Though that may not show it, the screen ocasionally flashes aswell, as if something rendered right in front of the PC.

I've tried disabling all my mods and my ENB, even going through a clean install, but it still happens.

I'm running on a Radeon 7850; is this a known issue?