Perian is a free, open-source QuickTime component that is no longer being developed. Noise Industries recommends removing Perian from your system. There is also a new build of FxFactory 4.0 (Build 3650) that users can update to.
Read more about this thread in the Moving to Adobe Premiere Pro group on Facebook.
FxFactory 4.0 just came out a few days ago. It's an amazing set of video plug-ins for the Mac that work in Final Cut, Motion, After Effects, and now Premiere Pro. They are solid, fast and really let users get creative with effects. Read more about FxFactory 4.0 here.