When I fire up Mocha and make a new file I need to browse to import my video. I select the video file (mp4 from Sony PMW-EX1) and it just hangs there. I let it sit for 30 minutes on multiple occasions. I had to kill the program. Ideas?
You should probably ask mocha questions on the After Effects forum, since it's a utility application for After Effects, not Premiere Pro.
If you haven't already looked at the AE forum, you can also trying Imagineer Systems' (the authors of mocha AE) message board. Their tech support guys monitor it pretty closely: