HI davewitherden,
 
Do you get the same problem on demo http://www.ajaxuploader.com/Demo/select-multiple-files-upload.aspx?


We have improved the silverlight support in the latest version, if the demo works for you, please download the latest version and try again.


latest version download url: http://ajaxuploader.com/download/Ajax-Uploader.zip


Regards,


Ken