This behavior appears when upgrading from jQuery 1.3.2 to 1.4.1. It appears under IE 8.0.6001.18882 but not under Firefox 3.5.7.

A function bound with:

jQuery("#"+fieldName).bind('change', {...}, jQuery("#"+fieldName).RSV.fieldValidate);

is triggered only when an element is changed and loses focus for the second (or subsequent) time. That is, if the element gains focus for the first time, its value is changed, and then loses focus, the function isn't triggered. On the other hand if the element gains focus, loses focus, gains focus again, the value is changed, and then loses focus, the function is triggered.