I really need to add some click boxes to quiz slides for some added navigation. Is there any type of workaround to do that since that option is grayed out?
If you have Captivate 6 you can now add shape objects to quiz slides and make them interactive. If you're on an earlier version of Captivate your only option is to use the button widget that ships with Captivate. It's a Static widget and can therefore be added to quiz or quiz results slides.
Could you tell which version you are using? If you are using CP5.5 or earlier, as Rod points out the static button widget could help you, because it has navigation functionalities, but you have to be careful not to leave the quiz scope. On CP6 this will be easier because quiz scope is dynamic.
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