trouble with variables - requiring slides to be visited before another slide opens

I got it to work. I think that there was an issue with the button to "Using Visuals Effectively" as it went to the "Preparation" slide. When I changed it to where it should go it worked. 

Also the way you have it set up trying to click the "Using Visuals Effectively" and "Measuring Learning Outcomes" is really hard. It seems that you have to click the darker blue part of the image rather than anywhere within the circle.