I have v1.5.6 installed and working just great using the 'PayPal Payments Standard' gateway.
We have just upgraded to 'PayPal Payments Pro' and activated the PayPal Payments Pro (UK) module
When testing LIVE the order shows ok in orders as complete

copy from log
2014-07-24 9:36:03 - PHP Notice: Error: Table 'mysite_ocar176.oc_paypal_order_transaction' doesn't exist<br />Error No: 1146<br />SELECT * FROM `oc_paypal_order_transaction` `pt` LEFT JOIN `oc_paypal_order` `po` ON `pt`.`paypal_order_id` = `po`.`paypal_order_id` WHERE `pt`.`transaction_id` = '7Y649506M98597336' LIMIT 1 in /home/mysite/public_html/store/system/database/mysql.php on line 50
Can anyone shed any light on this ? Thanks all