It sometimes depends on the ENB, some enable them differently. Aug 25, You verify gamefiles by rightclicking on Fallout NewVegas in the Steamlibrary -> Properties -> LocalGame Files -> Verify Integrity.

Find that value and set it to zero if a 'letterbox' value doesnt exist. Went to Guardian Peak bumped up the bright as much as I could just to see, didn't even have to enter the cave, just jumped down to the lower ledge near the exit of the case, it started flashing back to good, once it was good, I went to another point on the map, it stayed good even after going back to Nellis and spending over an hour doing all the stuff there. A few of them call it 'vignette' even though thats not really what it is. This page is what kept me from restoring from an old save after trying everything else possible. Just to add, I had the exact same issue, was blinking a bit first, then when dark/blurry when I went to Nellis. I went to Guardian Peak, entered the cave, and when I exited the blur was gone. I had the same problem, it seems like the way to fix it is to go someplace where the effect is supposed to happen, enter, and exit back to the wasteland. The only solution I've found is to reload a previous save. I checked to see that Im not crippled or have any status ailments.

Sometimes Im just running around and the screen goes very dark and blurry with no apparent affect on the HUD or Pip Boy. I made this video to better show what has been happening to me.

Fallout new vegas enb black screen