They work against flatfooted and flanked enemies, but whenever I try to sneak attack against "enemies whose Dex bonus to AC are denied", I get a great bunch of nothing. This trend started happening recently, since entering the ToEE more or less, I don't understand if it's a bug or me missing something about how combat works. Look at this. Blind AND prone, and yet whenever my rogue attacks him I get no sneak attacks whatsoever. What gives?