I may have an idea here.
EnsurePublishedFromColumn is used to make sure the extra column in the destination list exists, which will be used to store the url of the source item. Since you are getting an object not set in the column lookup call, it's probably couldn't get a handle to the SPList object for the destination list.
Crack open your workflow in SPD and check that the URL for the destination list is set correctly. I'm guessing it still points to the location of the site before you moved it via stsadm.
Although this method is called for updates as well, you wouldn't see this problem because it's using the existing URL stored in the updated item.
I don't know for sure that this is your problem, but it seems to fit the symptoms and it would be an easy thing to miss.
Let me know if this isn't it.
-Ryan
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