Hidden Next button issue

I am working on a course that links to multiple videos. I don't want the students to be able to move forward in the course until they have viewed all of the videos. I created a main Menu slide that takes them to each of the video slides. Then when finished with the video, I have it set up to return to the Menu slide. Lastly, after they have Visited all of the videos from the Menu slide, they should then be able to click Next to continue to the final slides in the course.

I like using the Trigger feature to HIDE the Next button and then SHOW it after the items on the screen are visited but am consistently run into problems when returning to theses slides. Once I return to a slide where the Next button was hidden, it does NOT reappear even though the set items are in the Visited state. I have even clicked on the items again to "Revisit" them but the Next button still does not appear and it leaves me stuck on the slide. This is happening on both returning to the Menu slide and the video slides.

Here are my trigger set ups.

• Change State of Next Button to Hidden when Timeline Starts.
• Change State of Next Button to Normal when (xyz button) is Visited.

My only other option seems to be to NOT use the triggers to HIDE the Next button but rather put Conditions on it where they can Jump to Next slide on Condition all of the buttons are Visited. However I prefer to not use that method because the Next button continues to display even though they can't use it until they have visited all of the items.

Any suggestions?

I'm attaching a trimmed down version of this course so you can see what I am referring to if you return to the Menu slide or any of the video slides.

Thanks!
Kim