Database problem.

[ForceHSS]

Try this

SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `tagcontent`
-- ----------------------------
DROP TABLE IF EXISTS `tagcontent`;
CREATE TABLE `tagcontent` (
  `tagid` int(10) unsigned NOT NULL default '0',
  `contenttypeid` int(10) unsigned NOT NULL,
  `contentid` int(10) unsigned NOT NULL default '0',
  `userid` int(10) unsigned NOT NULL default '0',
  `dateline` int(10) unsigned NOT NULL default '0',
  PRIMARY KEY  (`tagid`,`contenttypeid`,`contentid`),
  KEY `id_type_user` (`contentid`,`contenttypeid`,`userid`),
  KEY `user` (`userid`),
  KEY `dateline` (`dateline`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;