I am having a similar problem, getting:
Missing Application-Name manifest attribute for: http://mybooklive.device396078.wd2go.com:8081/Admin/webapp/htdocs/MapDrive.jar?v=18
Using Java version 7, update 51
Won’t work on FF or IE, although it ‘used’ to work on FF up until several weeks ago.
Grrrrrrrr…