Loading of old worlds is temporarily disabled

Launcher works just fine but when I try to load a world all of my worlds are totally unavailable. 

There is red text under each which states "loading of old worlds is temporarily unavailable" but I can't see any scheduled downtime on Mojang site or twitter account. 

A help article I read told me to uninstall the program, clear my cache, reinstall the program and launch.  I did all of that but it didn't change anything. 

Another help article suggested if I have Windows 10N I might need to install a Media Features Pack.  I have Windows 10 Pro so that pack is built in it seems. 

Attached is a screenshot of what I'm seeing.  Appreciate if you can let me know how to resolve. 

 

Thanks a million,

Jen