I've just updated to wordpress 2.8.6 and the category menu bar content has disappeared. The categories themselves are still there and can be viewed as a regular widget. Anyone else has experienced this?. Thank you

Ok. I just checked the thread from Harpek: http://forum.bytesforall.com/showthread.php?t=2918 an it seems to be the same subject here that happened with a previous version of wordpress : a "My category Order" plugin compatibility issue. After deactivating-activating the plugin categories are displayed correctly.