I wish I known this before:

“Java for both 32-bit and 64-bit IE browsers.
If you use both 32-bit and 64-bit browser interchangeably, you need a Java Plug-in for each browser. Hence you will need to install both 32-bit and 64-bit Java respectively.”1

1) http://www.java.com/en/download/faq/java_win64bit.xml

I just found out the paper I co-authored at uni for a conference is in Google books!

http://books.google.com.au/books?id=QsDm8OvRyIwC&lpg=PA1&dq=Oscar%20Aguilera%20AI&pg=PA1#v=onepage&q=Oscar%20Aguilera%20AI&f=false

I been looking for a good example that has ZK, Spring, Spring Security and Hibernate and this example looks perfect and it is well documented

http://vs171030.vserver.de/test/pages/index.zul

the sample app is hosted here

http://vs171030.vserver.de/test/

Some more info on ZK with Spring-security

http://www.zkoss.org/smalltalks/zkspringsec1/

ZK studio only works with Eclipse Galileo and I at this time I think i need an older version of Java SDK

http://www.oracle.com/technetwork/java/archive-139210.html