>I know our apps wouldnt work under 7.0 as there is a problem with _assign methods, they fail to release references to objects properly internally. We pass references to forms through _assign methods to a form handler and since they are not release the forms refuse to close properly.

This is a bit obscure, but causes the problem you describe when using assign methods to handle properties containing object references. We received the bug report from David Bower, who also works for Quids Technology. Look for something on this in SP1. Believe me, we're listening!