[Christa Simonds]

The same thing happened to me. I am using a Vid rate of 29.97 using Apple Intermediate Codec. Frame sizes vary. I tried a few different things, trashing preferences, rebooting hard drive… The answer turned out to be pretty simple. Set my settings in my sequence tab of my option bar to 100%. I don’t know why it wasn’t there in the first place but hopefully that will work for you as well.