Hi, thanks everyone.

@Ganderoleg: 1 should be always the minimum and the maximum is the maximum you can set.

@mpdeveloper_B: Thats strange, i've tested it on 3 different machines and never got a crash or a 'ghost image' after changing resolutions. Can you please post your acklog.txt and your pc specifications?

The quality settings doesn't actually correspond with those settings in your driver utility (means quality=1 doesn't means 2x fsaa and etc). Often nvidia and ati gives you some extra features with these settings, so for example quality=2 gives on my nvidia card an extra overall blur, and quality=3 and 4 looks exactly the same.
I can't change this behavior, this is it like in directx world.
The best thing is to give your customers a simple slider from 0 to maxquality.