You're the one closest to the situation to be able to answer your questions. Talk to the folks who have provided feedback and find out what player version they are using and what browser version as well. To help anyone to find out which Flash version they are using, send them to the following page:
Mysteriously, every person I have asked for clarification on the issues has replied saying that the problem has been resolved. I have no idea what happened except that maybe the file wasn't finished uploading?
Curious. Very curious...