I've been having the same problem the past couple days, the hot fix was supposed to take care of it, but after the update, I had leg armor and a helmet (both rare thankfully) decrypt into nothing but a bit of glimmer, that of course was after the cryptarch turned 3/6 other engrams into motes, lol, fun cryptarch session.... Back to the point, unfortunately this fix hasn't fixed it on my end just yet, hopefully it'll b done w soon

Have lost 15+ myself

This happens when you have 25000 max glimmer. Instead of receiving no glimmer you receive nothing for decrypting and engram, not cool. Please fix!!!