I am using a embeddable Flash based MP3 player (The standalone Version of Wordpress Audio Player, to be exact) to play audio on the web page of a client. Given the nature of Fla
This is likely because the sample rate info in the header file does not match the sample rate the file was encoded with. Try fixing the problematic file with one of the MP# fixer utilities: google search.
It is also possible that this is a driver issue on their pc, and reinstalling/updating their audio driver may solve the problem.