Last week I had the bug that after completing one Heroic Adventure, the other two were greyed out as "already active." Last night before the reset, I was able to complete a second one, with a buddy as fireteam leader. Oddly, after completing the second adventure and returning to Vance, the two previously locked Heroics showed up as available.
After the reset, the Heroics are again all greyed out, the first two show as "already completed" and the third shows as "active." Which of course, it is not, and none of them have been done this week.
So, reset doesn't fix this bug.
Strange things happen when another person is fireteam leader.
I mistakenly thought this known issue would be addressed by the 12/12 update.
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Go to Mercury and pull out your Ghost. If you see a red/orange shield marker with a sword in it, go do that mission and then Brother Vance's missions will become available again. If you don't see the adventure marker then you are probably screwed for this week.