cascadingdropdown default eval problem

I have several cascadingdropdowns (configured as check-boxes) on a form. When displaying an existing record they show the correct selections of checkmarks. For a new record, each has default eval code to generate a required selection of checkmarks initially. JDump shows that this generates arrays (of string values) that appear correct, but a checkmark only appears in the checkbox indicated by the first item in each array. I have not been able to find much information in the wiki or forum about exactly how to do this; I presume I am doing something wrong, but can not see what it is. Can anyone point me in the right direction please?
 
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