Well this is the error I got at the time of installing hte product,
MySQL Error : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-End Error Mess = 'a:4:{s:17:\"custom_link_added\";s:44:\"The custom link has su' at line 1
Error Number : 1064
As far as the datbase error itself, it depends on the hack, but lets use vBug Tracker for example:
Database error in vBulletin 3.5.3:
Invalid SQL:
UPDATE language SET title = title, phrasegroup_inlinemod = 'a:37:{s:19:\"approve_attachments\";s:19:\"Approve Attachments\";s:13:\"approve_posts\";s:13:\"Approve Posts\";s:15:\"approve_threads\";s:15:\"Approve Threads\";s:15:\"clear_post_list\";s:18:\"Deselect All Posts\";s:17:\"clear_thread_list\";s:20:\"Deselect All Threads\";s:13:\"close_threads\";s:13:\"Close Threads\";s:14:\"delete_threads\";s:14:\"Delete Threads\";s:12:\"deselect_all\";s:29:\"<strong>Deselect</strong> All\";s:14:\"from_this_page\";s:17:\"From This Page...\";s:16:\"invert_selection\";s:33:\"<strong>Invert</strong> Selection\";s:11:\"merge_posts\";s:11:\"Merge Posts\";s:13:\"merge_threads\";s:13:\"Merge Threads\";s:16:\"moderated_thread\";s:16:\"Moderated Thread\";s:23:\"moderated_thread_prefix\";s:10:\"Moderated:\";s:10:\"moderation\";s:10:\"Moderation\";s:10:\"move_posts\";s:10:\"Move Posts\";s:12:\"move_threads\";s:12:\"Move Threads\";s:12:\"open_threads\";s:12:\"Open 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This action can not be un-done.\";s:37:\"are_you_sure_want_to_delete_product_x\";s:166:\"Are you <b>sure</b> you want to uninstall the product called \'%1$s\'?<br /><span class=\"smallfont\">(%2$s: %3$s)</span><br /><br /> %4$s This action can not be un-done.\";s:13:\"developer_key\";s:13:\"Developer Key\";s:7:\"disable\";s:7:\"Disable\";s:13:\"edit_plugin_x\";s:44:\"Edit Plugin <span class=\"normal\">%1$s</span>\";s:14:\"edit_product_x\";s:45:\"Edit Product <span class=\"normal\">%1$s</span>\";s:6:\"enable\";s:6:\"Enable\";s:31:\"existing_install_uninstall_code\";s:31:\"Existing Install/Uninstall Code\";s:13:\"hook_location\";s:13:\"Hook Location\";s:18:\"hook_location_desc\";s:102:\"This specifies the location within the vBulletin code of the hook that will fire this plugin function.\";s:18:\"hooktype_admindata\";s:18:\"Admin Data Manager\";s:19:\"hooktype_adminindex\";s:20:\"Admin CP Index Pages\";s:13:\"hooktype_ajax\";s:14:\"AJAX 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Use this to temporarily turn plugins on and off.\";s:16:\"plugin_code_desc\";s:67:\"Use this field to enter the PHP code that you would like to be run.\";s:39:\"plugin_inactive_due_to_product_disabled\";s:99:\"<strong>This plugin is currently inactive due to the product <em>%1$s</em> being disabled.</strong>\";s:16:\"plugin_is_active\";s:16:\"Plugin is Active\";s:15:\"plugin_php_code\";s:15:\"Plugin PHP Code\";s:13:\"plugin_system\";s:13:\"Plugin System\";s:17:\"plugin_title_desc\";s:41:\"Enter a title that describes this plugin.\";s:22:\"plugins_disable_config\";s:71:\"<b>Warning:</b> Plugins are currently globally disabled via config.php.\";s:24:\"plugins_disabled_options\";s:276:\"<b>Warning:</b> Plugins are currently globally disabled in your options. In order for plugins and products to function correctly, you must <a href=\"options.php?do=options&dogroup=plugin\">enable the plugin system</a>. 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Here is the datbase error. I got a time out when tryign to post it.
I made note of the problem a week or more ago in the vB Staff Titles thread which is why I am posting in the SQL forums.