In February, Kleiner Perkins, T. Rowe Price, Morgan Stanley, Fidelity, and other investors pumped $490 million into Zynga at $14 a share in exchange for preferred stock that would ordinarily protect their downside. But Zynga’s growth has since flatlined. And now Zynga has filed for its IPO with an initial price range of $8.50-$10 a share.