I created a Premiere Pro CS6 project by sending a rough cut from Prelude. The new Premiere project successfully imported the three video clips and created a sequence based on the rough cut. Everything worked fine until I quit the project and later reopened it. Everything was present in the reopened project, but the audio in the sequence will not play. The audio still works fine in the individual clips. I'm working on new Mac Pro running Lion OS 10.7.5, 3.33 GHx 6-Core Intel Xeon and 6 GB 1333 Mhz DDR3 of memory.
There's a bug with this process. Until it's corrected, I recommend skipping Prelude.