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Adding a term to a vocabulary appears to work, but the term does not appear in the vocabulary afterwards.
Meta tags appears to lose the parent information of a term when the root is the sole parent.
The parent array is OK during the initial save, but when the term is updated (by meta tags I presume, as this was not a problem before I installed meta tags) the parent array is now: array() rather than array(0). This causes the row from taxonomy_term_hierarchy to be deleted and nothing to be re-inserted.