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The forum would not let me reply for some reason. Maybe the markup in the posting broke the page somehow. When replying all I see is a grey area where the subject and reply could be typed.
I replaced some of the rich:dataTable with a4j:repeat and the problem disappeared.
appears to be my problem as you suggested.
I would greatly appreciate some workaround to this problem.
Actually I see a workaround on the jira.
I will now try a4j:region with renderRegionOnly=true inside tab form.
I will post back here the results.