Most likely a setup issue.
Best way is to use the easy setups we provide (Final Cut Pro > Easy Setup). Then verify that in View > Video Playback matches your easy setup.
The same thing applies to playing your DVCPRO HD clip. Select the matching easy setups, then create a new sequence and drop your clips into it. You have to create a new sequence as easy setups do not affect existing ones.
regards
Kristian Lam
Blackmagic Design