WordPress SEO Disappeared in WP 4.0

Hi,

When I make a new page, I don’t have the option of seeing WordPress SEO on the page editor page. It does not give me the option in screen options to show it either. I just deactivated and reactivated the plugin, and now other existing pages aren’t showing it either. I checked the page source for one of them, and it appears to be there, though I did not clear the cache in the browser, only in WP after re-activating the plugin. Any ideas?

Thanks.

https://www.ads-software.com/plugins/wordpress-seo/