No files playing in Quicktime

Hi guys,
Having a major issue with Quicktime at the moment under Lion.
No files will play as expected, except for .flv files under the perian codec.
Most files open normall,y but when I press play, it instantly stops the video. Clicking play only circles a loop around and makes me click play again.
I did manage to open another file that played, but for the split second that usually the play/pause button issue would happen, a different problem occured.
The video plays, and once you click play, there is audio for about half a second, then it turns the audio off and carries on the video. Press pause, then play again, and youll get the next half second of audio from the point you paused the video.
I have absolutely no idea what to do here!

Same experience here on a 3GS. Voicemail .wav files attached to emails played fine under 3.0, and perhaps under 3.1 (not sure exactly when this broke), but it's not working at all under 3.1.2.
Wow, the strangest thing just occurred. I tried just now, so that I might precisely describe the symptoms (it had been that the attachment would start to download, but stop partway through, and QuickTime was never invoked). When I downloaded the attachment moments ago, the d/l completed, the icon on the file became a Q, and QuickTime played the message.
I'm wondering if it makes a difference that I am currently in the office and on Wi-Fi, rather than connecting via 3G. Have to do some experimenting, I guess.
But at least there appears to be no inherent incompatibility or QuickTime flaw.

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x

No files playing in Quicktime

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