For a course i took for my previous job (years ago) i had a textbook with a passage that was really badly written. After studying on the matter and also consulting a collegue i found about 4 or 5 different possible interpretations of that text. If that's the case, how the hell am i supposed to know what they mean?! In the end i wrote them about it explaininig all possible explanations i found and which way they better describe it if they meant case X (where X is the interpretation i thought was the one they actually meant it to be). At first i quickly got a reply that he didn't have time to do anything with it right now, but he'd come back to it. So i was thinking it was very nice of him to let me know i shouldn't expect a shortterm answer. But after that i never heard from it again.
Another thing i really hate is those multiple choice essays that have questions that state you should give the most accurate / best answer. If there is more then one accurate/good answer its all a matter of opinion. But with multiple choice you can't give a motivation on why you think C is better than B. So if they decide B is better you're screwed no matter how right you may be by chosing C instead. (Happened on the course mentioned above. Got a question where i thought one answer was better, but i gave a different answer as in some pratice questions i did i found out they thought the other answer was better. Totally disagreed with that, but as stated before you can't defend your choice in a multiple choice essay.)