LazyInitializationException:

If it happens on old code also, verify that you do not have a data corruption.
For instance, @ManyToOne, @ManyToMany or @OneToMany where the target no 
longer exists or is invalid...

TODO: Fix bad tab index

To fix IE5 - IE6, you cannot use CSS selector "td >" to do 
"onmouseover", use javascript instead like this:

onRowMouseOver="this.style.backgroundColor='#{a4jSkin.panelBorderColor}'"
onRowMouseOut="this.style.backgroundColor=''"

#{rich:element('id')}   == document.getElementById("generated id")
#{rich:component('id')} == document.getElementById("generated 
id").component

Limit the page refresh with <a4j:region> and proper list of reRender joined by ", "

Example:

<a4j:support event="onchange" 
		
actionListener="#{noteController.onChangeRequiredCategory}"
		 reRender="NoteCategorySelect, NoteSubCategorySelect"
		 limitToList="false"
		 ajaxSingle="true"
		 bypassUpdates="false" />

/ajax/error.gif is required unless you force a new dir for icons