I had a similar experience as crisw with some freeze-dried blueberries. When I added them to a warm melanger, with warm cocoa butter in there, it eventually just compressed the blueberry powder to a thick muck on the bottom stone of the melanger.
I suspect that it may be partially because I was lazy in the powdering of the blueberries, and still had a number of big chunks in there. I figured the melanger would crush them, not just compact them on the bottom. It took a couple of hours of soaking to be able to pull the compacted blueberry chunks off the bottom, and is definitely not something I want to repeat. Anyone have any suggestions, other than powdering the blueberry better, so that my second try this weekend doesn't end in tears?