I posted a couple of weeks ago with this same issue, but what I have noticed is that sometimes the stereo clips turn to mono. It is most bizarre!
I understand all that has been written in the forum on this topic, but am still curious as to what is going on. All the audio issues I am having are with 48k audio files, created within FCP, and from CD's (converted from 44.1 to 48). As with Bill, some files don't have any colour, but some have green, some have purple, and some have a mixture.
Thanks everyone,
Tim