Aha ChromePlanet !
We share the same problem-mine in PAL.
This excellent link will take you to the some of the answers/noted problems.
http://www.sjoki.uta.fi/~shmhav/iMovieHD_bugs.html#quick_DVimport
I'm back to using iMovie 2.1.2 on a G5 2GIG so I can reliably do a long project with the DHR-1000. It can only be described in polite/very polite terms as "ridiculous."
Here's why:
1- iMovie 4.01 will import but on playback but will constantly have digital artifacts overlaid on viewing to external TV monitor. Pulling in/out the firewire cable from the deck (2x after a long moment each time)temporarily restores the picture until I click on a clip, bringing on the problem again. The solution is to use a camera to be able to view externally. Even then, I often have to reboot the computer otherwise there is no recognition of even the camera.
2- iMovie 3 similar problems
3- iMovie 2.1.2 works with Sony deck. instant playback view via external Sony deck.
Most of my projects are 2-4 hours. There is no other way to archive these without a DVCAM tape. Thus iMovie 2.1.2 is for me the only one of these versions I can trust.
And iMovie 5???
All the great advances in flexibility since version 2 mean little/mostly nothing in practice. So you have to ask Apple-Why is the firewire signal so weak in imovie?. I have asked , but no reply....
Was the Powermac you sold running Panther? Is that why the Sony deck was recognised?
Regards
Mark