I have changed several of the module settings in the DB without any luck. I even changed the HomeTabId in the Portals table to try to get it to open a different page, but it still opens the Windows LiveID site.
I no longer think that the IFrame is filling the screen, but rather that the login process is not working correctly. That is, on login the DNN site is not opening at all, but the Windows LiveID site is opening instead.
Before I tried putting the Windows LiveID site in an IFrame, the login was working correctly. I could login directly to DNN, or I could click on the LiveID button on the login screen and login to Windows LiveID and get redirected to the DNN site. Now, I can't get to the DNN site after login no matter how I log in. I even disabled the Windows LiveID feature on the login screen by changing LiveID IsEnabled to False in the Authentication table, but when I login at the DNN login screen it still takes me directly to the Windows LiveID site.
This doesn't seem to be an IFrame problem any more (although it seems to have been triggered by adding an IFrame), so maybe I am in the wrong forum now.
Vitaly, I appreciate your previous suggestions, and if you have any suggestions for stopping the redirection to Windows LiveID I would be glad to hear them. Or if you think I should post to a different forum please let me know. Thanks.