Third party apps are not supported by Sirius, they are supported by the app developer. About a year ago Sirius changed how you login into the site. Cosmetically the site looked the same but the backend changed. This broke all of the third party apps. The apps that have, or at least had at the time, an active app developer were fixed. At that time C-ApiSRO was no longer being supported by the developer and was broken. Recently, around 1-31-11 or so, Sirius merged the Sirius site with the XM site to give the same look and feel to both types of users. This change again broke all of the third party apps., and only the apps with current developers were fixed. SxRadio2 is one of the apps that I know of that is no longer supported.
As of today, SiriusWM6 is still supported for Sirius and XM logins.
You can find it here.
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