Hi there Bud.
Hardware specifications like Graphics or is it a 32 or 64 bit machine could help. Maybe you have skiped some codecs?
Try typing that into console window in both of them
rpm -q -a --qf '%10{SIZE}\t%{NAME}\n' | sort -k1,1n > installedstuff.txt
and in your /home/user directory you will find nicely formated text files with all the repos installed.
Compare those two files. Below is link to how to do that.
http://www.pclinuxos.com/index.php?o...1618#msg391618
Try starting the player via konsole on the production machine (for example gmplayer typed into konsole window and accepted with enter will start mplayer in gui mode) and then try playing any of the not working files. In the console you should see the output of the error. Google that then and see what the story is

.
In PCLOS MiniMe 2008 that I am using there were two symlinks missing from /usr/lib/ and even when I had windows-codecs-all pack installed it wouldnt play real player files till I have created them.
I hope I have helped.
Andy