I encountered an issue where after upgrading to the latest version of the Date Range Picker and JQuery UI 1.10, the preset date ranges did not change when selected.
rp.find('.range-start').datepicker('setDate', dateStart).find('.ui-datepicker-current-day').trigger('click');
rp.find('.range-end').datepicker('setDate', dateEnd).find('.ui-datepicker-current-day').trigger('click');
rp.find('.range-start').datepicker('setDate', new Date(dateStart)).find('.ui-datepicker-current-day').trigger('click');
rp.find('.range-end').datepicker('setDate', new Date(dateEnd)).find('.ui-datepicker-current-day').trigger('click');
I checked the API documentation and the DatePicker.setDate function appears to never have accepted the long integer version, so perhaps the JQuery UI team made a change recently that broke this assumption?
Anyway, hope it is helpful. Your widget has been really useful to me.