JAWs Reader is not reading ALT Text

I am also encountering problems with tabbing and check boxes. Normally, when you tab to a checkbox or button, you need to press enter in order to trigger the action.

In 2 of my current projects, on some screens when you tab to the check box, nothing will happen until the enter key is pressed - this is expected behavior. On other slides, and this is all within the same project, just tabbing to the check box will activate it. I've deleted check boxes and recreated them but can't get rid of the problem.

Any suggestions? I've spent way too much time trying to fix the problem but it's still occurring and these were due yesterday.