We've had that problem with ezurlalias_ml in eZP4. It was a known Bug. Updateniceurl.php doesn't work, if the table has content. We had to drop the table's content before running updateniceurl.php - after running the script than, we've had clean entries.
BUT if you try, please make shure, you've made an backup of the table's content ;)
Best regards and good luck
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