in m-b, tools/update-packaging/make_incremental_updates.py supports only v2 signed osx64 packages. So if you feed a prev. v1 signed package and a current v2 signed package, it chokes. Assigning this to Callek (by request).
I landed ttps://hg.mozilla.org/releases/mozilla-beta/rev/625cd745ca82 on the m-beta seamonkey relbranch to verify this fixes us. If it does I'll submit for a proper review (with the right bug # cited to point here, rather than at the seamonkey specific bug)
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