An addition to the problem; pages I visit where the form is filled out and I’m logged out also tend to give me an error for not being able to establish a database connection, when I revisit (with my own profile logged in) the page after clearing my cache and trying to post a comment. When I return to the page after the error page, it gives me a filled out form again. (Happened to me twice in the ‘When was the podium filled with champions?’ article.)
Edit: It doesn’t log me out or give me a database connection error if I clear my cache, stay on the page and then comment..