By the way I forgot to mention that I am building this course in Captivate 4.
Do you have a quiz in the project? If so, you could have your quiz settings configured so that questions MUST be answered before you may continue.
For example, perhaps you have a 40 slide project. You have some buttons on slide five. Button one jumps to slide six. No problem. Button two jumps to slide 20. No problem. But Button three tries to jump to slide 30. And on slide 28 you are asking a True/False question. Your quiz settings may declare that the question on slide 28 MUST be answered before you may continue. In that case the button would appear to fail and not jump to slide 30 because the question on slide 28 hasn't been answered.
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Thanks for the tip, I looked at my quiz settings and it seems that I had it set to require the user to complete the questions to move on. I have reset the quiz setting to allow the user to skip the quiz and now all the modules that follow the quizes are working.
Thanks again for that tip. I'm definately going to be using that a lot in the future