V19 build 651. Hearing the dreaded audio "popping" kinda sound like a Geiger-Counter going crazy-radioactive from time to time. Sometimes it's there other times it's gone. It does render. I thought this old issue had been fixed, I probably missed the solution. The imported audio is 48k and plays clean till I import into the Vegas timeline. When popping is present it plays in the same place on the timeline. I am running the "Wave Hammer Surround" plugin. I have re-booted with no effect.... and it just started had been working great a day before.