Same issue – after first-time install, settings page could be accessed. I added an event, went back to the settings page, and it’s not showing any Settings content between:
“All-in-One Event Calendar Notice: To set up the plugin: Select an option in the Calendar page dropdown list, the click Update Settings.”
and the button:
“Update Settings”
It’s also now not showing the events on the page either.
It’s a great plugin otherwise!
