sounds extremely strange... I have not heard anyone have a similar problem before. Are you connecting from behind a proxy server (if there is animation when you open the Java webstart client, then the answer is yes)?
Maybe you have a firewall that might "lock down" due to something the RDA client does? One thing you could try, is getting the latest JRE to see if that has any effect on the issue (unless you of course already have it)
Otherwise: E51 is now available on the system.