black screen - problem

Hi Tomas,

Thanks for reaching out and sharing that image! This looks like the Resume prompt that appears when you revisit a course that you have closed out.

You can change that option by going to the Home tab, clicking on Player, and reviewing the Resume options under Other.

You can also check the language in the Text Labels section under the player properties as well! Though, I do find it odd that it shows a language that you don't use! Due to that behavior appearing, I've opened a case on your behalf with our support engineers to take a closer look at your file. 

Feel free to share it using your personal upload link here, and we'll do some testing and provide next steps!