Storyline 2 publishing with blank slides

When I publish my Storyline 2 project in Articulate Online some of the slides are showing up blank. I have read through other discussions on this topic and tried many things to troubleshoot this. So far I have checked my internet settings, used different computers, different web browsers, republished the project, uninstalled Storyline 2 from my computer and reinstalled it then republished, created a new project and imported the project into it and published. Nothing is working. More and more slides are showing up blank and each time it seems to be different slides. However, the slides with videos are always showing up blank. Some of the other slides that are blank are supposed to have text, some text and images, some text, images and interactions. I did notice that if I go to the next slide and then go back to the previous slide that was blank it is no longer blank, with the exception of the video slides. They remain blank. Some of the video slides are my own created videos and others are embedded YouTube videos. The videos show in Storyline 2 and the embedded ones work when I use the test link.