Hi Guys,
I've got a related problem, with a fresh install of UC Alpha7e, anytime I run cron.php i got a warning :

user warning: Not unique table/alias: 'upc' query: DELETE upc.* FROM uc_orders AS uo LEFT JOIN uc_payment_credit AS upc ON uo.order_id = upc.order_id WHERE uo.modified <= 1193501589 AND uo.order_status = 0

Any help would be greatly appreciated,
Thanks