Re: LowLevelFatalError [File:Unknown] [Line: 3958] Retry was NOT sucessful.
Interesting.
I don't doubt there may be problems with the software. However, if you're waiting for the Dev's to fix this particular problem for you, I wouldn't hold my breath.
The first thing you should do is ask if anyone else has had the same error and right now most people are playing the game and not getting this crash while optimizing files.
Not sure how far through the optimization files it gets, but the program seems to be searching for a file and not finding it.
You said you verified your files, which is a Steam thing. Did you use the repair function on the EA launcher?
If that doesn't work, some more information about what happened with your computer when it stopped launching would help. Because you said the game was functional before something happened to make it non-functional.
Maybe the program is having problems finding the files on multiple drives? Putting everything on a single drive might be help . . . but this is time consuming task . . .
I'm pretty sure that the optimization process accesses a ton of files and during that process the program can't find the file it's trying to find on your system. Without that file the program will crash.