Had the same issue on a different server, this time migrating from Plesk 9.5 to 11.5
logs/migration-2013-12-05-08-12-38-668/deployer.log:<subscription-info><sysuser name="username"><cron>
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logs/migration-2013-12-05-08-12-38-668/deployer.log:*/5 * * * * php -q...