As some other members have mentioned, I've been getting database errors pretty frequently over the past few months. Normally, I solved the problem by clearing my cookies. But there is a better solution that doesn't require me to continually clear my cookies. The following solution works for Chrome. Don't know about other browsers.
1. Go to "Settings" in your Chrome Browser
2. Under "Privacy and security" click "Site Settings"
3. Click "Cookies and Site Data"
4. Under "Clear on exit", click "Add", type "http://thepoliticalforums.com" into the prompt, and click "Add" again.
5. Now your browser will automatically clear TPF cookies each time you exit the site.