OK.
System: 2 x 2.8 GHz Quad Intel, Memory – 4 GB 800 MHz
FCP: 6.0.6
Footage: 720 x 480 DV/DVCPRO
Sequence Settings: 720 x 480 NTSC DV (3:2), Pixel Aspect Ratio: NTSC – CCIR 601 DV(720×480), Field Dominance – Lower, Compressor – DV/DVCPRO-NTSC at 100% quality
The footage is for a video artist’s installation, so it’s not so straight forward to look at (i.e. no faces or anything recognizable). So a screen grab wouldn’t tell you a lot… hope that makes sense.
Thanks so much for all your help!