The cable length is not a problem - the spacing between the cable's board connector and the first connector, is. The first connector needs to be 5mm further down the cable away from the board connector. I will be making modified ones available in the next couple of weeks if there is interest.

Have you checked that the second drive on each unit is properly jumpered for Slave, and that the jumpers are the correct size for the drive, and are making contact on the pins properly? If both drives register as Master, perhaps this explains some of the symptoms. Mark knows better than me on this as he wrote the drivers!!!!