First, there's always the possibility that you have a corrupted file which is what the error message is telling you. Have you tried another .mpg? Second, 1.3.9 was by far the most pain in the ass minor upgrade I can recall. Following that, Apple released a Security fix, plus a Java fix. If you only ran the 1.3.9 upgrade, look for the others and see if that doesn't fix it. Following that, run something like MacJanitor and then fix permissions with DiskTools. Failing that, look up the Apple Discussion boards for OS 10.3.9 and see if anyone else had the same problem. Hope this helps. . . On May 7, 2005, at 11:48 AM, Thom Holland wrote: > Hi all, > > I've upgraded to 10.3.9 and now *.mpg movies don't play. What gives?