Let me get this straight...
While the value of their investment has dropped, the whole sector has. In fact, Blackrock's investments in the sector (not just Banro) have dropped 61% while the sector has fallen 54% over the last several years. This looks pretty darned close to me, especially when you look at how many juniors are going through BK or just gone altogether.
And Blackrock still gets their 'special dividend', and Banro hasn't missed a payment.
In case I forgot to mention it above, Always Just My Opinion