Continuing problem - "Access is denied" client error

I have struggled with this problem for a couple of months now with no solution yet.

I am migrating an existing web site to a newer user-friendly web using AJAX and the AJAX Toolkit controls. I am using a couple of the tab controls on a couple of pages, including the default page. I am using VB 2005 along with SQL Server 2005. The production server is running IIS 5.1 (and yes, I have installed AJAX and the toolkit on it and yes, the dll files are in the bin directory).

Everything works fine on the development machine, but after copying the files to the production server and then viewing the site in IE (6 or 7) on any machine, there are "Access is Denied" errors when trying to use one of the tab controls.

I have searched the internet and did come across and article about this error, but it pertains to using IFRAME and I am not using any. I have uninstalled and reinstalled IIS on the production server, I have uninstalled and reinstalled both AJAX and the toolkit.

I am at a loss - is there anything that I am overlooking? I would like to have this newer website up and running by June 1, however if there is still these errors, I will have to revert back to the older non-AJAX enabled site.

Thanks for any information.

Anybody?

Here is a thought too and I don't know if this has anything to do with it, but my site is run locally at home using a static IP address. The URL is registered through Yahoo Small Business.

Would that have anything to do with it for any reason?

And to add to it, the error points tohttp://<the ip address>/thewebpage