Web Access Non-functional after upgrade to SD+ 6

I have just completed an upgrade to SD+ 6. Prior version (5507) worked fine. No errors or failures of any sort during upgrade. Now, when I attempt to access the site using either IE7 or FF, I get garbage on the screen like:

��srjava.rmi.MarshalledObject|��c�>Ihash[locBytest[B[objBytesq~xpH�"^pur[B��T�xp¬�sr org.jnp.server.NamingServer_StubxrZjava.rmi.server.RemoteStub��ɋ�eZxrjava.rmi.server.RemoteObject�a�� a3xpw6 UnicastRef2 192.168.1.9( ދ� Ŕ�x

I continue to get e-mail notices from the system, so it looks like the back end is still functional. The web site, itself, is the part that is failing.

Anybody else run into this or have an idea how to fix? There are features in 6 I really want to use -- hate to go back to a prior version.

Thanks!
Brad