I discovered today that I can't create new sites that allow me to post. Everything else in the new site appears to function, but when I go to post or edit an existing post the editor doesn't display.
I can post and edit on all sites created before today.
I did update WP this morning (can't remember if it was before or after I update WP).
I tried creating several sites after discovering the issue and it's the same for each. No plugins active on the sites that aren't functioning and using the 2010 theme. Also tried in several browsers in case it was an issue.
Anyone have any ideas?