Next button flashes briefly even though hidden/disabled
I am using Storyline 360. I would like for the Next button on the Modern template playbar to be hidden or disabled until the user goes to the next slide. So, for example, they are viewing Slide 1. The Next button is hidden. The slide automatically advances to Slide 2 at the end of the timeline. If the user clicks the Previous button (or exits the module and then enters that slide again on the LMS), the Next button would become visible.
I set up triggers with variables.
Default for Variable 1 is False.
On slide 2, I added a trigger, "Variable 1 is set to True when timeline starts".
Back on Slide 1, the Next button is hidden if Variable 1 is False. Also, on Slide 1, the Next button is Normal when Variable 1 is True.
So this is working... kind of. What's happening that I don't want is that the Next button is "flashing" quickly at the start of Slide 1 the first time I visit the slide if it's hidden. Or, if I just disable it, it's enabled for 2 seconds or so and I can click it.
Any ideas how to keep the Next button from "flashing/enabling"? Perhaps I am using the wrong triggers/variables?