Eventhough the server migration complete, A lot of tweaking has to be done to ensure they are running properly. So have patience. Check the thread http://x10hosting.com/forums/news-announcements/115601-updates-upgrades-etc.html
According to corey's post even though the servers are done. There are more tweaks has to be done.
The correct url is the url from your account management panel. Did you tried the same url for the FTP.
Did you checked the tutorial about http://x10hosting.com/forums/tutorials/102062-how-get-asp-net-work-x10hosting.html
And moreover the starka just done and more tweaking has to be done. This may be causing th issue with the ASP.NET pages.
you can host another domain making it addon domain so that it will point to another folder on your account. no need of another account.
Or you can park the domain and use the .htaccess to point it to another folder.