Pretty self-explanatory. Too often I get a rogue into what I think is a valid sneak attack position, but for some reason it doesn't proc and just does a normal attack; mostly with ranged attacks. As a fundamental class ability this needs to be clearly defined. If I'm not going to get the extra damage dice, I need to know before I make the attack Action. The sneak attack exists as a seperate button already so it just needs to either be greyed out, or give a prompt that the selected target is invalid.
