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I haven't heard of this particular issue, but I would recommend contacting Tableau's Technical Support Team. You can submit a case here: Support Case | Tableau Software
If you can, please attach log files which capture the issue.
I have the similar issue...I've tried to use refreshextract with a extratc that have two connections (cross database left join between a Access and XLS) and I don't know how to do the command.
Sorry to bring to life this post again, but I think that tableau have solved this problem.