Same problem; PC. Got the quest normally, took down the cyberpsycho and left him alive, picked up and read both shards and...nothing. Can't call Regina, and the psycho just suddenly dies, even though he was moving (and I was wearing the Target Analysis optical mod, which supposedly makes weapons non-lethal).
Also, I encountered another quest-breaking bug in Pyramid Song: the part where you're staying in the bungalow. You speak to Judy and she tells you the outcome of Pisces (depending on your choices); then you're supposed to speak to Johnny. Johnny never appears; his quest marker (which should be inside the house, as I recall from before the patch) appears outside on the dock, but he never appears.
Both these bugs occurred after I installed Patch 1.2. Up until then, I had no problems with quest- or game-breaking bugs.