We have a v6.7 ready now, which should fix the multiple occurrences of each dialog box when you click a DetachPipe option. It attempt to detect existing toolbars in Outlook, and hence prevents new ones being added (which cause the multiple windows).
However, you may find that if you open an email, and right click the toolbars area, that you have more than one toolbar called 'DetachPipe'.
If so, delete all the unchecked 'DetachPipe' toolbars until there is just one left.
If you still get multiple windows, then uninstall DetachPipe, run Outlook again (so Outlook realizes not to cache DetachPipe's toolbars anymore), close Outlook, reinstall DetachPipe, and finally, run Outlook again.