Bit of a back story
I set up a cell builder and moved it to the house for ease of use, left a good sized split behind. to raize a queen and collect the foragers  Split had capped ten+ cells on day 5. I came back day 10 to cut out cells and they were torn down, just gone with no sign they were ever there. There was one left that turned out non-viable. Gave them a bar of brood from an overwintered daughter hive , came back and nothing.     
Went back and did a fly back split on the overwintered hive and gave the troubled split another bar of larva /eggs,. came back today (10 days) to make splits and there was nothing.  Found one cup with what looked to be 5 day old larva  in  it with dark  (grey )stripes and a bunch of empty cups 

Now the cell builder hasn’t turned out a viable cell yet.  Lost 4 rounds. I had blamed the incubator as I found it spiking to 100f So I left this last round of grafts be finished in the builder, took a peek and the bees seem to be ignoring the cells tore a few open and they still look ok, figured will know in a  few days

But after today I am not so sure I don’t have another issue as well. 
Hives have sold brood pattern, getting 80% or so take on the graphs.
 In the incubator tip of the cell is turning black, bunch of “goo” in the tip. I get the impression the larva/pupa is dying and falling to the bottom and rotting. Doesn’t sound like what I have read on BCQV.
any thoughts?
Seth C

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