Answer. One thing that can cause this problem is if you double-click the quiz link instead of single-clicking it. If you double-click the link Blackboard could try to open the quiz on the first click and then try to open it again on the second click. You will have to ask your instructor to re-set the quiz for you and then be careful to not double-click the link when you re-take the quiz.

Another thing to check is for popup blockers. If your instructor set up the quiz to open in a new window it may be that Blackboard is trying to open the quiz but cannot since you have a popup blocker on your computer. The next time you click the quiz link Blackboard will report that the quiz is in progress. You will have to ask your instructor to reset your quiz and then disable your popup blocker in order to take the quiz.