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After reporting of few bugs i found this new release... and I decided to upgrade.
But a pair of new important bugs apper:
1) All my description tags, for contents (not for special pages), now shows only: description="array"
Meta Keyword are corret.
2) Values of Meta Keywords in some contents (apparently in random way) are moved to Meta "Copyright".
I made an immediatly downgrade to 6.x-1.9 with restoring of database.
I hope this warning could be usefull!