Hi Alex,
what version of cs4 is it, have you got both ame and ppro saying they are the same version number (4.2 latest).
what files are you working with, what are you trying to export out to and do you have any special tick boxes running in the export settings?
thanks this info should help us to test ourselves if this is indeed a bug.
Cheers,
Jon Barrie
Jon Barrie
aJBprods
http://www.jonbarrie.net