Black screen with Play Icon

Hi Bridget. This usually happens if you have media (video or audio) on your first slide, and WCAG and most browser protocols prohibit 'autoplay' of media on first load.

This thread contains more info and some workarounds.

Black start screen | Articulate - Community

But in my experience, if you add a completely blank slide at the start of your project, remove the default Back and and Next buttons, and then add a trigger "When timeline starts jump to next slide", this can trick Chrome, Edge and Firefox into loading your true first slide without showing the black screen and Play button.

This won't work on mobile devices, however, and in some corporate intranets, so I'd recommend testing it.