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[03-Aug-2017 00:11:54 UTC] PHP Notice:  Undefined index: paypaldp in /home/harmony2/public_html/includes/classes/payment.php on line 169
[03-Aug-2017 00:11:54 UTC] PHP Notice:  Trying to get property of non-object in /home/harmony2/public_html/includes/classes/payment.php on line 169
[03-Aug-2017 00:11:54 UTC] PHP Notice:  Undefined index: paypaldp in /home/harmony2/public_html/includes/classes/payment.php on line 141
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[03-Aug-2017 00:11:54 UTC] PHP Notice:  Undefined property: ot_subtotal::$credit_class in /home/harmony2/public_html/includes/classes/order_total.php on line 120
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[03-Aug-2017 00:11:54 UTC] PHP Notice:  Trying to get property of non-object in /home/harmony2/public_html/includes/modules/order_total/ot_coupon.php on line 136
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[03-Aug-2017 00:11:54 UTC] PHP Notice:  Undefined index: paypaldp in /home/harmony2/public_html/includes/classes/payment.php on line 183
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[03-Aug-2017 00:11:54 UTC] PHP Notice:  Undefined index: total in /home/harmony2/public_html/includes/modules/order_total/ot_group_pricing.php on line 32
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I also overwrote the /includes/modules/payment/paypaldp.php file from one of the other v1.5.1 sites that are working perfectly, with no result.

I did a /includes/modules/payment/paypaldp.php file comparison between 1.5.1 and 1.5.4 and there are a number of differences - it is somewhat superfluous as the 1.5.1 version of that file works in any case

So maybe somewhere else amongst the payment files I have something missing ? ... or do I need to uninstall OPC and remove all associated files and then re-install?

cheers,
Mike

p.s. not sure if you needed ALL of the above but better to give it all than not enough info .... maybe?