I didn't see any errors in the OST system log, or in my cpanel error log. Those are the only places I know to look.Your answer didn't quite fix the problem, but did point me in the right direction. When I deleted the values for client_avatar and agent_avatar, my ticket threads appeared blank, so I put them back to what they were (gravatar.monsterid and gravatar.mm). Even though the agent one was set correctly, it was not displaying mystery man gravatar (gravatar.mm). Once I changed the client gravatar to "mystery man" in the GUI, the database then reflected "gravatar.mm" for both entries, and then it displayed correctly inside my tickets.I don't recall ever changing the client one, so it may be possible that changing the agent one automatically changed the client one, but some kind of glitch prevented it from changing back.Thanks!