Thanks Stijn for sharing the info; this issue appears to be consistent across app servers: Richfaces 3.1.6 has this same problem with JSF 1.1_01 - Reference Implementation on Weblogic 9.2.3. I followed this post, downgraded to Richfaces 3.1.5 & JSF postback started to work fine.
However, Richfaces 3.1.6 works well (on this issue of handling page postbacks) with JSF 1.1_02 Reference Implementation.
Hope Richfaces release notes specifies the minor version of JSF implementation that they support, in future.
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