Hi,
I am getting the same issue. I need to provide authentication credentials three times when opening the DAT
The OS is Windows 2008 R2 SP1. When I click cancel on the second popup it then opens the form without further popups.
I used fiddler to capture the web sessions, and the first popup corresponds to a HTTP OPTIONS request, the second to a PROPFIND WebDAV request, and the third is the HTTP GET request.
Its an inconvience more than anything, but would be good to understand what's happening.
Thanks
Steve