I struggled and but then i found the reason and the solution. In Richfaces 3.3.2 CR1 there is some JS code in form.js, which tries to get all elements from the surrounding form. Like this
//.. var field = form.elements[fields[i]] //..
This seems to fail only in Internet Explorer.
But why? I don’t know for sure, but it only occurs when you nest forms. Nesting of forms is invalid HTML, so it is not a bug in Richfaces. Check your UI structure instead.
<!--Not valid / never do this--> <h:form> <h:form> <!--stuff--> </h:form> </h:form>
Remember: NEVER ever nest forms into form.