What is your session lifetime? Does a user get ViewExpiredException or he/she can go through pages and only ajax does not work?
No exception is thrown, even the reReder call works properly and user can go through pages. The only thing is ajax call to methods not work.
add <rich:messages/> to the page.
I already have <rich:message /> in my page,
do I reallly need to use <rich:messages/> to see if there is any error message?