I had dark shiny bees a number of years ago (7 or 8 perhaps?) but it was in relatively small numbers and went away later in the season. Four or five years ago I had a colony that collapsed and was only just rescued. Last year I had it, one colony survived well although there were dead bees outside in quite high numbers - the queen remained, and the colony did quite well in the circumstances. This season there have been some dead bees outside, although the colony's growth halted so they were not as congested this year before the queen was superceded. A queen taken off this colony last year showed no signs of CBPV this year. The other colony last year that suffered quite badly had a large pile of smelly dead bees outside and it had colonies either side of it which had no signs of the disease. The suffereing colony did generate swarm cells and was eventually requeened and the original combs were re-used, with no subsequent signs of the disease. And yes I probably should have changed over to new comb. From my very limited experience, it would appear that requeening could be the answer - in the same way as you requeen when you have a bad case of chalk brood.
May your bees read the same books as you do.