hi! as i understand: the setting "enrol_cost" in paypal-plugin should be used, if a course has no cost set. but it doesn't. the error is in enrol/paypal/enrol.php where this is checked on line 25 and 95: if ( (float) $course->cost < 0) // use default cost else // use course cost but if i add a course it has the cost of 0. so the solution is to change the if-statement to check for less or equal than 0: if ( (float) $course->cost <= 0) regards, daniel.