Same is happening for me, as well as on the main site.

Database Error Database error
The BDSM Library database has encountered a problem.
Please try the following:

* Load the page again by clicking the Refresh button in your web browser.
* Open the home page, then try to open another page.
* Click the Back button to try another link.

The forum technical staff have been notified of the error, though you may contact them if the problem persists.

We apologise for any inconvenience.
It's a vBulletin error, I wonder if the admins updated their vBulletin recently. I've run into the problem a few times on my forums.

Could also be an SQL database error.

Due to control panel as well as the main page being affected, but the forums being fine, I'd guess it has to do with the User Stats, New Posts, or Last Visited calls.

- J