After a "perfect storm" involving a hard disk crash, and the inability to recover one of my accounts, I have also lost the ability to play old video files.
I tried to update or reinstall the DivX codec set, but I don't remember what I had originally done to get the videos to play.
These are mpg and avi files. I do have Flip4Mac also.
Some of the files don't play at all; others are highly "shortened." That is, an 8 minute video appears to be only 28 seconds long.
I am thinking if I had the right codec, this could solve the problem.