Some of your students may have installed Internet Explorer (IE) 8 on their computers. Please notify your online students that they may have problems using IE 8 with Blackboard. They can click the Compatibility View toolbar button in IE 8 or better yet, they can use Firefox instead.
One of the problems they may report is that they can't submit a timed test because the timer button is too big and is covering the Submit button. They may also have trouble submitting assignments.