Short version:
I've been playing 6 characters for a couple of months and just yesterday all 6 of my characters suffer from the "blind" effect. I can see every part of the ui but the environment is pitch black.
Long version:
By process of elimination I have figured out how to fix this problem, but I have not identified the exact culprit, and the solution is a giant pain in the butt. This all began when my pc locked up solid while I had all 6 of my characters online. I was forced to do a cold boot and ever since then all 6 of my characters are "blind". The only fix that I have found that corrects this issue is to find your characters UI file (ie: UI_CHARNAME_HiddenForest.ini ) and rename it to something else or delete it. When you relog back in your client will regenerate this file and all is fine and the blind effect is gone.
Except all is NOT fine, it takes me forever to get my UI pieced together exactly the way I like it and having to rebuild my screen takes a lot of time. As soon as I get home I'm going to fix my ui the way I like it, log out, and make a backup copy of my file. I should have done this a long time ago but this lockup problem only happened twice for me in the months that I've been playing and both times it perma-blinded my logged in characters. FYI it does not make any of my characters "blind" who are not logged in during a pc crash so this is a file corruption issue with UI_CHARNAME_HiddenForest.ini. I've compared my "corrupt" UI with an auto generated one in WinMerge and there are vast differences, I've yet to determine exactly what in there is getting fried.
Another interesting piece of information is when I'm "blind", it doesnt matter what I set the game resolution to, still blind. But if I change the settings to full screen I'm no longer blind, but when I switch back to windowed mode I'm blind again. This is not a fix for me, I'm not playing 6 characters full screen, it's windowed mode or nothing.
Client: Underfoot (separate directories per character)
OS: Windows 8.1
Video: Nvidia GeForce 760 R331 Game Ready Driver Version 331.65
Updated spell file & THF game file: of course
Skin: doesnt matter, blind with all custom skins and default. /loadskin default doesnt help
Zones: it doesnt matter what zone I'm in, still blind
Blind with default skin:

Blind with custom skin:

Question:
Has anyone been able to identify what elements in the UI file are getting jacked? My goal is to find out exactly what text in the UI files are getting jacked so if this happens again I can just open the file with Notepad++ and quick fix the problem. This is a tedious trial and error process, there is tons of junk in that UI file for every window you have ever opened.