1st off...whats the deal with this level leaking warning. What's the effect and how do i get rid of it, i read a the little it had in the manual, but that didn't cut it.

Also, about fog, ive messed around with it a little but it doesnt seem like i can get what i want. it just makes junk look faded in the background instead of looking thick like real fog...is this the volume fog that i read in earlier threads i researched? is what i want possible?