That was the first thing we did the when he was having troubles ... he updated to the latest version of silverlight and got rid of the error message.
When he first installed/updated it was all good for a little while, then a few days later he was unable to select more than one image?
He's since checked he's got the latest version of both flash and silverlight, but he's stuck selecting one image only.
Fortunately I've got an older browse-select uploader he's maknig do with, but it'swearing a bit thin for him as he's got hundfreds of photos to uplaod.
Any ideas much appeciated!