I have a single remote ASA5505 on my network and have managed it with the ASDM 5.2 Java applet.  After upgrading my browser to IE8 and running Microsoft patches and a Java update, I can no longer get the Java applet to work.  I get to the Java login, then it just dies.  I also tried Firefox 3.6 with the same result.  I can still connect from a remote system running IE7.  Are there known compatiblity issues with ASDM 5.2?