Tab disappears when switching to https://

[mlauser]

I have a nyroModal window with two tabs at the top, one Launches the content of the modal window into the main page - "Launch In Main Page", and the other closes the modal window. When I changed the URL of the content from http:// to https://, the first tab disappears, and only the close tab remains. I can't find anything that would act on the visibility of the first tab based on the URL of the content. Thank you in advance for any help.