It sounds as if your footage doesn't match the sequence. Check on that.
Post your screen cap again.
I dont have a Mac but I could not get my multi-cam window to do what yours was showing.
Ok here it is again. Someone suggested that maybe my sequence does not match my clips.
SEQUENCE INFO: AJA HDV 1440x1080i 29.97 preview format: I-Frame only MPEG
CLIP PROPERTY: 1280x1080 pixel aspect ratio 1.5
Although the size is different, I don't think it should look like this...
I am at a complete loss. Any thoughts...anyone?
Do create new sequences that exactly match your footage, and Cut/Paste your clips into them. Even if such isn't the cause of this issue, it's still a good idea.