I am using a database prefix, and when I go to the chat messages page link, though the Navigation menu, I get the following error message:

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table '[database name].drupalchat_msg

It contniues to show the full query, but the important part is there. I am using MySQL, should it be relevant.

One adds the database prefix through putting { these brackets } around the table name in code; atleast that was the case in Drupal-6.x. If I get the time, I may make a patch myself.