I always worry about these messages because it is usually a sign that the hack installation failed of someone tried to uninstall it but fails so the remnants of the hack are in a state of limbo. Check your chat hack to see if you can find the SQL to add the table back to your database. It should be in the installation XML. I checked the installer and it was suppose alter the "mgc_cb_evo_chat" table, guess it didn't ?
Here are the SQL statements if you need them:
Code:
ALTER TABLE `mgc_cb_evo_chat` ADD `isthreadwarning` TINYINT(1) UNSIGNED NOT NULL;
ALTER TABLE `mgc_cb_evo_chat` ADD `ispostwarning` TINYINT(1) UNSIGNED NOT NULL;
ALTER TABLE `mgc_cb_evo_chat` ADD `tpforumid` INT(10) UNSIGNED NOT NULL;