[QUOTE=lat9;1333522]Mike, is the site that's not working set for "all SSL all the time" using DrByte's recommended:
Code:
define('HTTP_SERVER', 'https://www.example.com');
define('HTTPS_SERVER', 'https://www.example.com');
define('ENABLE_SSL', 'false');
Cindy thanks so much for your last response - modifying that code in paypaldp.php didn't work ... BUT it got me investigating SSL status in admin/includes/configure and includes/configure ... in the latter I had define('ENABLE_SSL', 'TRUE'); instead of 'true' .... inadvertently used 'CAPITALS' for 'true'.

So so simple a mistake caused a lot of work on your part and others in the PayPal Pro thread.

I am really grateful for your assistance.

So at the end of the day your plugin works perfectly in v1.5.1 'straight out of the box without modification'.

many thanks,
Mike