Clips play at half speed, why?

Why do some HD movie clips play in half speed if dropped on the timeline, but others from the same play just fine. This happens on G4 2x1GHz PowerMac with iMovie 6, the footage is 6 h of HD video from Canon HV20.

If clips have imported at slower than real time ..which can happen with slower Macs.. then sometimes those clips, and their audio, continue to play at half-speed after importing.
I've found that quitting iMovie and then restarting usually brings them back to normal speed, because that empties the program's "cache" memory, so it reads the clips afresh from the hard disc.
If that doesn't fix it, sometimes chopping off a frame from the start of the clip restores everything to nroaml ..oops! ..er, "normal"!

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