As a normal routine, we update plugins when we see updates available. We saw an update for All In One SEO Pack (not Pro) today, so we went ahead and installed the update.
Now since that update we've been unable to add new posts or deactivate/activate plugins, or do much of anything except clear out spam entries.
Additionally, whenever we go to another page in the Admin area we get the chirpy blue and white "Welcome to Version 18.104.22.168!" popup with the following text:
Thank you for running the latest and greatest All in One SEO Pack ever! Please review your settings, as we're always adding new features for you!
We checked our AIOSEO settings, need no changes and clicked "update settings" anyway, but that doesn't make that popup stop showing up. We can't deactivate the plugin either.
We need to publish a new post and we can't. Greatly frustrated.