Most times, the error messages for the fields are grouped and displayed in a single alert. From the looks of the java script that is generated by cold fusion, it should always group the error messages and display them in a single alert.
On the occasions when I get the individual alerts popping up, the validation on the checkbox also does not work. The validation fails whether the checkbox is checked or not.
Tests were conducted in IE9 and Firefox 24 on Windows 7.
Any idea why the java script would work differently? Is it possible there is an old version of CF that is being picked up sometimes?