Gotcha, thank you 🙂
I’m using Chrome, but now it magically works. So I guess it’s resolved.
This was happening with my site as well. It’s something dealing with the old pages already created. If you make a new page, you can save and change the settings with the sidebar, breadcrumbs, slider, etc.
For a Calandar, I use “The Events Calendar” plugin. It works very well 🙂
It seems that I fixed it, Old Pages don’t seem to save any Page Meta data.