How can I use MyBookLive like DropBox?

Hi there and welcome to the WD community.

Try using a different browser to verify that you get this error on other browsers. You can also uninstall java and then do a clean install. I you try this and still get the same issue, i recommend contacting support for further assistance in this matter:

http://support.wdc.com/country/index.asp?lang=en%22