Ok, I'm no Java expert (there is one, but he's not around right now!) Try using this link for downloading Java:
http://www.java.com/en/download/manual.jsp
Follow the instructions for download, then reboot & go back to that link to verify the Java installation. This is a download of update 6... I can't find the same procedure for update 8 (the latest). I'm using LW 4.12.6 Pro with this same update 6... give it a go & see if installing then verifying the install makes any difference.
(apologies if you've already tried this method!)