Having trouble with timing of button in Safari

I have a course I am designing in Articulate Storyline for a client that it utilizing a "next" button on the slide to advance the learner to the next slide. I have set up the timing properly in my timeline for the button to appear just as the voiceover concludes the end of the slide and made certain that the button extends to the end of the slide. In Chrome it is all working properly, but my client is viewing the course through Articulate Review using Safari on a Mac and the timing is all off. Even though I have a slight overlap of the voiceover and the next button appearing, it is several seconds of nothing happening before the button shows up for her. Has anyone else hit this before? Thanks!

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