Digital BW, The Print

I know this is a little off topic but I mainly use my Eye-One for 
creating BW profiles so I hope no one objects to this post. I keep 
getting a calibration error when either trying to use iMatch or Measure 
Tool. The expensive doorstop has been checked by UK service department 
and sent to Switzerland. No fault found. I mainly use it with my G4 
Powerbook running 10.3.9 I have also tried it on my PC under windows 
XP. Same problem on both computers. I have a clean installation on 
both. Interestingly in Measure Tool using spot measure it works ! It 
keeps failing when trying to measure a chart. Ocasionally it works but 
not for long. This is driving me nuts. Any ideas.

Peter