I hate having to use browser apps, especially those using flash. Is the desktop application not supported anymore? Would I get better quality over the desktop application?
As you see from the official reply, Sling are trying to stop people using the desktop app. But although it isn't supported any more it still works perfectly well and many of us old-timers still use it in preference to the Web-player as it has much more functionality and is much more flexible. Although I will admit there doesn't seem to be any difference in actual picture quality.
I found an old version of the desktop app and downloaded it, but it seemed to need to be on the same network as the slingbox in order to work. Is that true?
Which version are you using ? The final versions are at http://support.slingbox.com/go/windows-download-desktop-us and http://support.slingbox.com/go/dl-mac-desktop