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I would guess that both this behavior and what you're seeing have the same cause - unknown cause at this point.
I've noticed in the past week or so that directory listings are showing below sites that weren't showing them previously (although the sites were in ODP).
Beth
I think bether2 was writing about this thread:
New OPD dump visible in SERPs - the directory not up to date at this time [webmasterworld.com]
I also have a site that got into DMOZ last month and while the site is in Google search, it is not in Google directory. A month, though, is surely too soon to be worrying about that.