I'm teaching a sophomore class of 50+ students. At first, they seemed baffled at how to address me. I was addressed as Professor X, Dr. X, Ms. X., and Dr. "First Initial". All of these are cool with me except calling me Ms. It drives me nuts! If the students can address male professors as Dr., then why not the same for female professors? An informal survey around my department indicated that no male professors were called "Mr" and that female professors were sometimes called "Ms".
So now we've identified the problem here: students call female professors "Ms" at my particular university. I've cleared the problem up mostly for my course by the following actions. First, I sign every email as "Dr. X". Second, in class, I refer to myself in the third person as "Dr. X". Third, I tell the students "My last name is hard to pronounce, so you can pronounce my name as 'Dr.X'". I cleared up the problem in about a week without calling out a student for their misguiding addressing. Unfortunately, this problem will come up every semester that I teach, so I've got to cringe through the "Ms".
Other than that, I'm happy with teaching. It's fun and rewarding!