I have this same problem. Windows Media Player plays sound and video. Splash Pro 1.1 only plays sound, no video. However, it plays the AVCHD files, video and audio, much more easily than WMP. When I select "show information" while the file is playing, I show
stream type: AVI
Video type: Not available
video framerate: Not available
video bitrate: Not available
Audio type: Linear PCM (Stereo, 48000Hz)
These files were pulled from the camcorder through Sony Vegas Pro 9.0e 64-bit.
I use Windows 7 Home Premium 64-bit.
The AVI files which will not work are from a Canon miniDV and from a Sony Digital 8 camcorder.