Detailed Description:
The siteprefs for lastrun of the crons are not updatet.
$this->SetPreference('Last'.$period, time());
the Preference was not set, because "cms_siteprefs::set" dont recognize that
this Preference exists
and
ADOConnection._Execute(INSERT INTO cms_siteprefs (sitepref_name, sitepref_value)
VALUES ('Cron_mapi_pref_LastYearly',1326812908))
comes than with "uplicate entry 'Cron_mapi_pref_LastYearly' for key 'PRIMARY'"
this makes the module not useable.