I am running FCS 1 on a Mac G4 dual 1Ghz 2Gb Ram, OSX 10.5.4 FCP, Compressor, LiveType etc all latest updates. Everything works fine apart from Compressor which does not. I have spent hours with apple trying to sort the problem but the cure only lasts a day or two then I get the irritating message cannot read background files. So, is there any other app that I can use to replace compressor to compress FCP files into H.264 files? All help and suggestions very welcome!