Hi.
I'd searched online for more details about completely removing Silverlight so I could reinstall, and got this from a US site. I'd done a reinstall and tried a different browser already, but the difference with this list was point 4 and 5 - removing this file as part of the uninstall then reinstall seems to have done the trick for me.
- Press Cmd+Alt+Esc and quit all open browsers.
- Select the Finder icon from the dock at the bottom of the screen.
- Press Cmd+Shift+G (shortcut for "Go to Folder...").
- Paste "/Library/Application Support/Microsoft/PlayReady" and press return.
- If the folder cannot be found, verify that you have administrative access.
- If the folder still does not exist, skip to step 6.
- Drag the file mspr.hds to your Trash.
- In Finder again, press Cmd+Shift+G (shortcut for "Go to Folder...").
- Paste "/Library/Internet Plug-ins" and press return.
- Drag Silverlight.plugin to your Trash.
I still haven't heard anything back from Sky technical support, so hopefully this is of some help.