The number of particles displayed In the Windlight First Look viewer (79674) is dramatically less than it should be. Tested in windowed and full screen mode with the same results. Moving to a new region or waiting several hours seems to temporarily resolve this, but only for one emission and then it's back to having barely any particles.
Attached is a screenshot comparison of what it looks like in Windlight with the maximum particle count to 4096 and the Release Candidate also displaying 4096 particles.
edit: oops. I didn't notice the message saying it was a duplicate issue. my apologies!