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Try adding a4j:queue.
Thanks, with this hint I was able to solve the problems. Just for the records:
I added a view-wide named ajax events queue (outside of any form):
<a4j:queue name="menu_queue" />
This queue is referenced from the aj4:poll-component as well as from all RichFaces menu items that caused the problems. Interesting enough, these were only menu items that cause a SWF external redirect to some other flow definition.