Storyline- Next button to become available after visiting another slide

I have struggled with this idea. My problem with the "Visited" usage is that, won't it trigger at the start of the last slide's playback? This means that the last bit of content they need to see might be bypassed.

To get around this, I set up individual variables per slide to check/set each slide's Next button status. If there are multiple layers on a single slide, I set up a group of temporary variables to track playback on these, then check at the end of each layer's timelines for slide completion.

This can lead to a glut of variables, which is undesirable and also might lead to storage issues if you are using SCORM 1.2 rather than SCORM 2004 or above. Thankfully, this can handled using JavaScript. I may post an example of using JS to handle this problem. Have to go to a meeting right now though :).