first of all, i wanna get something straight: are mpg and mpeg the same thing or are they different formats that come in one container or is mpg a container for mpeg or vice-versa?

This is the error as it appears in the error log after i have doctored the specific avi i downloaded:

DivX Doctor II Shutting Down

DivX Doctor II (2.1) Starting Up

Doctoring AVI
FILE = Macintosh HD:System Folder:Preferences:Shared:Simpsons - Mojo the #13F85.avi
ERROR: Building Repaired AVI
FILE = Macintosh HD:System Folder:Preferences:Shared:Simpsons - Mojo the #13F85.avi
ERR = -223,
ERROR: Doctoring AVI
FILE = Macintosh HD:System Folder:Preferences:Shared:Simpsons - Mojo the #13F85.avi
ERR = -223,
ERROR: Error while Doctoring
FILE = Macintosh HD:System Folder:Preferences:Shared:Simpsons - Mojo the #13F85.avi
ERR = -223,

it doesnt make much sense to me but its repeated about 3 times in the error log

also, one more thought - the problem might be just as simple as the particular avi i downloaded was somehow corrupted so i think ill try downloading and launching another avi and see if that doesnt work.