MyLab Lessons are designed to accept the most common ways of completing a task. If you're trying to complete a task in an unusual manner, MyLab IT may not recognize what you're doing. Clicking the Reset button and starting again can sometimes get you back on track.
There are a small number of questions for which we are aware of issues that can cause problems in certain specific circumstances. Please check our Known Lesson Issues page to see if your question is on the list and how you can work around the problem.