I posted something similar earlier, but found out the issue is not theme related. Now I'm back where I started. I've also already tried disabling all plugins, this does not fix the issue.
Basically, the link button in the visual editor is malfunctioning. The window loads and displays the fields for entry, although the "link to existing..." is greyed out and not available. If if enter a url and info into the fields, I get redirected to the "posts" page and the changes never take effect.
I see others have had a problem similar, but for them the link window doesn't load properly at all. That is not my issue. It loads, just isn't functional.
Can anyone point me in the right place?