by request i updated the client with the newest files from jagex.
i have also made a small updater for fetching the newer windows clients and patch the Unix client with the newer jagexappletviewer.jar.
So if you ever end up with a black message box when starting the client then try
to run the updater to see if its a new version available.
The new client is available from the same link as always
Here are some screenshots of the updater in action :)