Sorry for not getting back to you sooner. Are you currently using Windows or Mac?
Minefield...As in Firefox's beta for Firefox?
If so then try using the normal Firefox (I know it works fine in my current version of Firefox).
If you ware using Windows, you maybe running the incorrect version.
Are you using 32-bit Windows or 64-bit. If you don't know go "Start"; Right-click "My Computer" or "Computer" depending the type of Windows you are running; then "Properties." The "System Type" will tell you if you are using 32-bit or 64-bit.
32-bit Silverlight 5 - http://go.microsoft.com/fwlink/?LinkId=229323
64-bit Silverlight 5 - http://go.microsoft.com/fwlink/?LinkId=229324
If you are using Mac - http://go.microsoft.com/fwlink/?LinkId=229325
If you are STILL having issues, try Silverlight 4 - http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0
Rawr was originally designed for Silverlight 4 but is backwards compatible in Silverlight 5. Try the links above. If those don't work let us know.