I got the black hammer and spent time and resources upgrading it. It is fully upgraded, but there is no yellow highlight around it, and it doesn't cause damage to enemies. I can't find an email to contact bungie/destiny anywhere.
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This is the only way to contact Bungie As for Black Hammer, the Hive Disruptor per was removed due to interference with White Nail, so it will not show as maxed. It still does max damage, don't worry.