Penn State Learning Design Community Hub

I have a faculty member who has dozens of Flash video clips produced from Camtasia studio. These video clips have been used in his classes for several semesters and had never had audio problems. However, recently the same video clips start giving out sporadic "tweaked noise" - something like playing a fast-forwarded audio cassette - along the normal narration. Meanwhile, any keyboard strikes recorded before now echo so much that they sound like fireworks.

Does anyone know what caused the problems and what are fixes? Does it have anything to do with the update of Camtasia studio or Flasher player? I certainly hope we don't have to reproduce all clips one by one. Thanks in advance!