[Zope] skip_unauthorized not working in dtml-in

Zope 2.4.3, Mac OS X. This code: <dtml-in expr="PARENTS[0].objectValues(['Folder', 'RSTX_Document', 'DTML Document', 'STX Document'])" skip_unauthorized=1 sort=id> <a href="&dtml-absolute_url;/"><dtml-var title_or_id></a> </dtml-in> Does not work in my setup. I know the permissions are fine, because skip_unauthorized is working as expected in a dtml-tree for the same objects. The Zope Book mentions another way of doing it -by assigning a property for those items to appear in the list and checking to see if it is true - but that doesn't work well for me because the public/private nature of many items will change often based on the time of year. thanks Kevin