Making Next button active when revisiting slide

Dear all,

I have some slides with layers. The Next button is inactive until the user has clicked on buttons showing the layers. However, if the user advances to the next slide and then goes back by clicking on the Prev button, I would like the Next button to be active so that the user doesn't have to click on all the buttons again. 

I looked at the discussion and suggested solutions in https://community.articulate.com/discussions/articulate-storyline/page-visited but I cannot get it to work for my slides.

Please have a look at slide 1.7 which is where I have tried to find a solution. I tried changing the second slide trigger into "Change state of the next button to Normal when the timeline starts if SlideVisited is equal to True" but then the Next button is active all the time.

I hope that someone can help me with this and look forward to reading your replies.

Thanks,

Helle