What about your RF version?
1) try to put rich:messages to your page.
2) try to set ajaxSingle="true" (was a bug in previous versions)
My RF version is richfaces-3.0.1.
I´ve tried to migrate to richfaces-3.1.2.GA version, but I haven´t been able to. In the following topic I describe my problem, but up to now no one has answered ;-(
At least, with ajaxSingle="true" I´ve solved the problem. thank you very much!! Anyway I´ll keep on trying to migrate to the last RF version.