Hi, First of all I'm converting an existing (and working) Zope product from version 2.1.4 to 2.3.1 and I'm having the following problem when trying to run the (new) converted version. In a dtml document which is run many times for different types of objects ie. something like <dtml-in " ... " > . . . <IMG ... src="<dtml-var expr="getIcon(REQUEST)">" ... > . . . </dtml-in> where it iterates through a list of objects, I get mixed results which I don't understand. When it works the getIcon function returns the path (using the REQUEST namespace) and icon for the particular object type and then this gets rendered as expected. But when it fails the icon for the type does not get rendered at all (understandably). After some debugging (ie. print statements) I found that when it failed the REQUEST namespace was not passing what I expected (it was empty), and when I tried to print the namespace it printed the following; <Special Object Used to Force Acquisition> So the python function (getIcon()) was expecting the REQUEST object but actually getting (it seems) is a derived (and unexpected) object, and failing when looking for particular attributes. I don't understand this behaviour (why it works for some and not others and why it worked in a previous version of Zope) and therefore how to fix it. Any help or pointers on the above or other relevant issues to upgrading older products would be appreciated. Thanks in advance Bernie Rossi.