I have a ZClass based on CatalogAware (no problem) and on DTMLDocument/DTMLMethod (it does not matter which). A number of instances are added in a batch. All this works well, but the id representation of the resulting instances are not uniform and sometimes they're just wrong. - In a normal manage_main view of their Container, the ids will show without problem. - 'objectIds' (and 'objectItems') also returns the right values, but objectValues returns a <string> (i.e. an object) instead. This cannot be brought to show its value (at least not by me) - All the same absolute_url also returns <http://bla/bla/<string>. This makes ZClasses subclassed from DTMLDocument/DTMLMethod unusable, at least for my purposes. I solved the problem by making a ZClasses based on objectManager, which is not ideal, but workable for me. Has anyone else seen this problem? Is there a solution/patch around. i have no idea how to debug this? I will post this to the Collector as well, but I thought this would be of an interest to the list as well. Rik