"Codec not installed"
I'm running a brand new MacBook Pro. I got Final Cut Pro X and Compressor 4.2 running. I have Pro Video Formats downloaded through the App Store. I tried Compressor on an mp4 file, hoping to convert it to ProRes so I can edit it in FCPX. Any attempt to use Compressor comes back with the "Codec Not Installed" error. THis isn't even for ProRes - literally nothing works. "Publish to YT", "Uncompressed", everything comes back with the same error.
MacBook Pro (Retina, 13-inch,Early 2015), OS X Yosemite (10.10.4)