Why does it need to be rendered?

MBPro, FCS 6.02, captured clips with a Kona card to Pro Res HQ. Created a three clip multiclip and everything was fine with my MBP. Last week, I had to do a clean install of my MBP and now, when I play the multiclip, it plays fine when collapsed but when I uncollapse it to make changes, it says I need to render. I checked my source material to match the sequence settings and it does. However, when I mouse over the render bar, it says the video needs to be rendered. The strange thing is that when it is uncollapsed and I hit play, the blue render screen is up. When I stop, the three angles in the viewer pop up and jump to the actual playhead spot.
Any ideas?
Jeff

FCE can do certain effects on the fly without rendering. Some more elaborate transitions, like 3D wipes, require too much processor time to do them in real time. My understanding is that Macs with greater on-board processing power do more of these effects in real time, while slower machines must render.
iMovie can do these effects on the fly because it's working with far less information. Think of iMovie works in the DV format while FCE works in the DV/DVCPRO-NTSC format. It's too subtle a name difference but the reality is quite different. It's like editing still pictures in compressed, lossy JPEG format vs. uncompressed TIFF format. Think about how long it takes your computer to open a photo of say, 8x10" 300 dpi in TIFF vs. that same file in JPEG. Well, that's what FCE has to do. It's working in the video equivalent of TIFF -- 30 frames per second. So there's a greater demand on your processor by a factor of 10. You can see this in action in Quicktime. Save a raw video import 720x480 in .dv and then in DV/DVCPRO-NTSC format and then play it back. The .dv will probably play smoothly while the DV/DVCPRO-NTSC (.mov) will hang up on play-back. It's just too much for your process to display all of those full resolution images so rapidly. And if you look at the two images side-by-side (particularly titles) you'll see how sharp and clear the .mov file is compared to the compressed .dv file.
Hope this helps.

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