Peter
It sounds like you are saying some of the footage was shot 1080i60 using the SP camera setting, and others shot using the camera’s LP or HQ settings, but you don’t tell which.
So first, please explain how you captured/impoted this footage into FCP.
And second, please confirm the clip item’s properties. Select a clip of each type, and press Cmd-9 and list down the Format settings.
Was all this footage shot on thesame camera or different camera’s?
When you play the clips individually, in the Viewer window, do they play correctly?
Cheers
Andy