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And to fix the problem, change /includes/classes/seo.install.php

near the end

) TYPE=MyISAM;";

to


) ENGINE=MyISAM;";

More info on what could be the cause of missing seo table
http://www.zen-cart.com/showthread.php?201382-How-is-it-possible-for-seo_cache-database-tables-to-disappear&p=1159230#post1159230

This is very disconcerting. Today my site was down with this very problem. What could have caused it? The only change I have made recently is to change configure files to always require https. ...