>Is there a limit on how deep you can nest object calls? I have an object which calls other objects with no problems but when one of the called objects calls another object I get an error. If I move that object into the first object, it seems to work.

I don't believe there is a hard and fast limit but there may be a limit with respect to performance gains. That said, you should be able to go much further than 2 deep. Take a look at any Office application object model. Ex. Application.ActiveDocument.Paragraphs(1).Range

Can you post an example of how you are creating your object chain?