More people are still having this problem? Odd...
Well, best advice I can give is to check what mods/.ini tweaks you are running, drivers are up to date, you have the latest patch (There is absolutley no excuse to not have the latest patch istalled, IMHO).
I realize you are trying to help, and do appreciate that, but this issue is not related to .ini tweaks, mods, or drivers. It is either an in game event or a corruption of something game related that sets this in motion. It can always be traced back to it's point of origin (assuming one is using named saves and has kept them), and then recreated simply by letting enough game time pass. It appears to only occur at higher levels, and happens to players with and without mods or ini tweaks.
For what it's worth (which isn't much) I'm on an,
i7 at 4.7
2 GTX 570's in SLI
16 GB of DDR 3 @1900
Skyrim is installed on an SSD,
every component is water cooled and temps are excellent. I've been building systems for 12 years and this machine's overclocks have been more than adequately tested and are rock solid. This is a bug that is solely related to Skyrim. The "revertworld" command demonstrates this.
If any of the above came out as rude or snarky, it was not intended that way.