Sadly, when I try to edit existing pages / posts in my dashboard, or create new ones, the HTML tab is inaccessible, and all the HTML options are displayed across the top of the visual tab. Publishing HTML in this tab displays as code.
I've eliminated "theme" as the glitch, and I've reinstalled all files (except wp-content) from a fresh download of WordPress. Neither has resolved the issue.
It was functional until yesterday night. Can't think of anything I've done in the meantime to affect it, but last week I was having issues with pages not being linked to the nav, and various .php files showing an error that prohibited me from logging in, but the reupload of WP fixed both of those issues.