USB connectivity issues with Canon 5d

Running 10.4.8, and Capture one Pro 3.7.6. we are trying to tether our Canon 5D to our computers.
It had all been working fine, but the camera had to go back to Canon for repair to USB connection.
On Return it wouldn't connect to either of our machines.
We tried to see if it would connect through Canon's own software, and it would not.
But here's the thing: a borrowed 5d won't connect either, and yet it connects fine to its owners computer. AND Our 5d connects to their computer.
Other point: we do have the ltest firmware, and have for a while. Also, Canon EOS 1ds connects fine through firewire.
I think this points to Mac, and maybe to Canon and mac. Anyone else have a thought?
(At some point I remember having to replace a .kext file when we went from 10.4.6 to 10.4.7, and the change to 10.4.8 made no problems, but there have been no updates to our software since the repair.)
Any thoughts on this will be appreciated...particularly if they solve the problem.
Sean
Mac G5 Mac OS X (10.4.8)

On Macs, tethering got broken recently, but that isn't your problem.
I know that some Nikons have two menu-settable options for the USB connection, only one of which works for tethering. Perhaps your Canon has something similar. (Nikon's are PTP and Mass Storage.)
Hal

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Hi, Pl4nt5NR4g5.
Thank you for visiting Apple Support Communities.
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Edited by: AMIT GHILDYAL on Aug 1, 2011 2:41 PM
Edited by: AMIT GHILDYAL on Aug 1, 2011 2:44 PM
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