Can you give some more detail about what's not working in your downloads? I'd love to figure out what's going wrong for you.
Note that, in most cases, users won't have to restart their browsers. I think a limitation in Safari requires that, but FireFox and IE shouldn't.
Also, Beta 2 of Silverlight 2 just came out. You might want to check if that addressed your issue:
http://on10.net/blogs/benwagg/Silverlight-2-Beta-2-is-out/
Ben Waggoner
Principal Video Strategist, Silverlight
Microsoft Corporation
Compression Blog: on10.net/blogs/benwagg/
Compression Classes at Stanford and PSU: on10.net/blogs/benwagg/21622/