Hi, hap123.
I have the same problem like you. Did you find any solution? I have been trying to solve this problem for long, but in vain.
Followed Jon Barrie’s advice. (make sure the multi-camera enabled nested sequence has that video layer targeted, if there are no targeted tracks or the target is on another track that is blank it won’t show up.) But It didn’t help at all. I read the help files and tried everything from the scratch, but wasn’t successful.
Please let me have your experience. Thanks.