No external video playback on 24' LED Display

Hi,
I'm having a problem using my 24' LED mini display port Cinema Display as my external video monitor with my macbook. I have trashed prefs, switched from all to single frames and back. Refreshed connections. Started new projects. etc.... All I get is the frame that I pause on from the viewer on the display but no actual playback except scrubbing. I'm using Final Cut (6) Studio 2. I have started from scratch many times and no success. Any suggestions?
Thanks in advance!

Sorry but I'm not trying to bump this but I can't find the solution anywhere. Motion and Livetype uses the second display in sync with no problems. FCP6 which once worked fine under this setup now only allows either the viewer to play or the monitor to play playback. They will not play together as they once did. Is anyone else with this setup having the same issue?
Macbook Pro (late 2008)
Final Cut Studio 2
24' LED Display (as external video monitor)
When single frame is selected viewer plays back only, all frames LED display playback only. I'm almost certain this is due to an update because this worked just yesterday and nothing has changed except the OS update. Like I said motion and the other studio programs use the LED display for synced playback from the viewer just fine. FCP is the only problem. Its not the end of the world and I can switch back and forth or break out my AJA IO but I liked the way it worked. Anyone?

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