Are you using seam 1.2.1 with richFaces/ajax4Jjsf enabled? I suffer from very 
similar problems. Randomly I get exceptions like your exception or exceptions 
like this one: "Cannot get value for expression '#{org.jboss.seam.messages}' "

After I switched off ajax4jsf by commenting out the ajax4jsf filter and the  
ajax4jsf.VIEW_HANDLERS within web.xml and reactivating the view-handler within 
faces-config.xml the problem disapears.

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