Was a mild issue before with 1_2 a day bugging and not giving me ammk, o ly the 5 min cd. Now soloing the heroic its decided i need 5, 5 min cds and not a single round. Thats fine if i was getting stuck in corners and running dry. One new bug to add to the books.
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The most common reason for this bug, is having a full consumables inventory. You can workaround the bug by putting a stack of something in the vault, clearing up a consumables slot. http://www.bungie.net/en/Help/Article/12282