Well, I found out the what, but not the why - another administrator had put Word and PowerPoint attachments to email tickets, and when he elevated their priority, OTRS stopped working. After deleting the attachments out of the database, OTRS began working again. I did notice they were the only records in the article_attachment table in the OTRS MySQL database that had a descriptor of "application/msword" or "application/powerpoint". I highly recommend phpMyAdmin for routine MySQL database cleanup tasks: http://www.phpmyadmin.net http://www.phpmyadmin.net/ STATEMENT OF CONFIDENTIALITY: The information contained in this message or any attachments to this message are intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material as well as being protected from disclosure. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is strictly prohibited. If you received this in error, please contact the sender immediately and delete the material from any computer.