Thanks for the suggestions everyone. Believe me, I've tried it all. I wont bore you with all the details but I have owned an H3D39, an H431 and an H440 and none have worked well tethered. I have also had demo units in H440 and H460 which worked equally poorly. Either the camera or the software locks up and it stops transferring files or corrupts those files it does transfer
All my cameras have been back to Hasselblad for "testing and repairs" and all have been returned without any improvement
I've tried dozens of Firewire cables and multiple MacBook Pro computers as well as having had one custom built especially for tethering on location.
I've always maintained the most current version of all firmware and software.
When I completely gave up on Phocus, I asked Hasselblad if there was any way I could tether to Lightroom and they said it was not possible. A digital tech on a shoot in LA later told me about the plug in Hasselblad had on their website for this exact purpose. I found it and discovered it had been available for at least 6 months prior to when the Hasselblad rep told me there was no such thing.
Using Lightroom has made the system "barely usable and frustrating" whereas with Phocus is was "completely unusable"
Hasselblad eventually told me to stop contacting them and to deal with the original retailer who is a really great guy and has since appealed to Hasselblad multiple times on this matter, loaned me cameras for testing etc etc. however, has been completely brushed off by Hasselblad (not a small dealer either, probably one of the biggest in fact)
Multiple emails to the President of Hasselblad USA have gone un replied to (message me, I'll happily share his email address).
The new H5 now has the ability to power the back from the camera or the firewire cable which indicates to me that they are fully aware of the problem and are hoping it will just go away without them having to make good on the previous models shortcomings.
They have offered to take both my cameras back at wholesale used prices against a new H5 however, their offer will mean I eat about $12,000 for cameras that never worked properly so, I've refused. They have said it's a "take it or leave it offer" and they have no further interest in discussing it or coming to any agreeable solution.
I've already spoken to a lawyer and am meeting him again in the next few weeks to discuss the matter, but, if anyone else can think of anything or wants to share their experiences, I'd love to hear from you.