http://www.cpsc.gov/cpscpub/prerel/prhtml13/13087.html?tab=recalls
Maybe it's just me, but this looks like a user error. Since our rock n play gets a lot of use, I wash the fabric part every week (or when it gets wet from a leaky diaper.) I also wipe down the plastic part with a Lysol wipe.
Just thought I'd put this out there so you can check yours for mold in case you don't clean it regularly.