Ever since updating to 10.1.1 I've been having issues exporting audio to movie. About 50 percent of the time the video file that logic creates is faulty. The first 10-20 seconds of pix are missing... just white. The sound works but no pics for 10-20 seconds. I've had this problem now with about 3 or 4 different projects.. all h264 format. It's been happening both on my MacPro running 10.9.5 and on my MacBookRetina running Yosemite. Any ideas?