I not sure anyone having this issue, as me or others player casting skills but the flashing light is in black pixel mesh problem.

Hmm so only i'm the one having this problem?

if something like this ^ , i would like to kow how to fix , the gameplay still very buggy plus shadows to "hide" enemies skills

Same problem here as well. It's kind of annoying.

Also, does anyone know where the settings for this game are saved? Can't find it.

There's no graphic settings in this game, heck even looking at the folders they're all in package format and there's no file that allows to adjust the settings...
So pretty much, graphic settings does not exist in this game, the only thing you can do is either this:
- Get a better graphic card (Buy, steal, lean, borrow)
- Update your graphic card (If that doesn't help, check if you have tweak your graphic card, change it back to default (it might work, no guarantees)
- Suck it up, deal with it and hope they will release graphic setting feature to this game in the future. (I personally feel it won't going to happen, but who knows.)

It's not about not having a good enough graphics card. I'm running a 7870, and it's fully up to date. I can run the game on 8x supersampling at 60 fps (and no, that doesn't cause the squares; the squares happen regardless).

Also, there are clearly settings in game, so they must be saved *somewhere*. I want to know where the file is because the file might have additional configuration options.

it looks like a graphics driver compatibility issue. what graphics card/driver do you use?

It's got nothing to do with hardware... -Facepalm-
Just wait until the day they might add graphics settings, or actually get the files working to fix it.

It's a loading error.