I have canon 60d footage from a tripod of a choir consert. In the original sequence the footage looks great. Once I place that sequence into a new sequence and enable multi camera, I have a double line that is visible both while it is playing and while it is stopped. Both sequences are dslr 24fps. The footage was at 24fps. I have cs5.5 on a 2011 imac with 12 gigs of ram. I have done 30+ wedding videos professionally and not had this issue before.
How can I get clean footage.
Best guess is that one of your sequences don't properly match your footage.
Frame blending was turned on on some of the clips and as soon as it was turned off, the ghosting went away. I was given the answer on another forum.
Frame Blending, even when turned on, only comes into play when the clip speed changes or when it doesn't match the sequence, so I still think you should check that.