Don't know if FXAA would be the source of the problem, now I am assuming that we are both experiencing the same issue for the same reason. Big assumption. Recently, within the last few days my rate of CTD has increased, only used to CTD after 2-3 hours (I have an old machine). Now I'm seeing it in 15 min or less and yes the occaissional purple texture pops up, as the frequency of purple textures appears the closer I am to crashing it seems. I don't have FXAA and never have had it installed.
Within the last week I have installed the Unofficial Skyrim Patch, did upgrades to Better Horses, Horses for followers (and bug fix), Followers can relax and the Ultimate Follower Overhaul. I'm not blaming any of these mods but something may have go corrupted by me in doing the upgrades, just wondering if any of this/these match anything you have running?
Any coincidences here....?
don't really see any but we seem to be having the same issue.
I got crashes from time to time within 2-3 hours. didn't bother me because that was a long time. sometimes it was straight CTD, other times i'd get a windows skyrim has crashed error popup.
In january after doing some edits to the uicellstoload and trying tesval and skyboost i started getting the purple textures within 45 minutes of playing, and it was bad, purple everywhere.
Basically got annoyed and couldn't fix it so i gave up.
now i want to play the game again, updated to the latest patch and now i'm the same as you. average of 15 minutes. Purple textures are my warning that the game is gonna crash usually within 1-5 minutes of the first purple texture.
If your having the same issues without FXAA, guess it does rule that out.
I don't have any of those mods installed. however i do have this one: http://skyrim.nexusm...ile.php?id=3111
and i did install that.
when i tried with no mods on i played for about 45 minutes with no issues. just tried with some mods installed and i got the issue again, and i did have that turned on.
kinda hard to believe it could be a follower mod, but maybe. this requires some testing.
i'll disable that and keep trying, and you should probably try disabling any mode that edits followers.