Hi Rolf, > what for are you using the -c2 option. > The DTP94 is an USB instrument and should work > without that option. This happens when I run dispcal without the -c2 option: > G4:~ rogerbreton$ dispcal -v -m -yl -t5000 -b95 -gl -e caltest > Setting up the instrument > Instrument Type: Eye-One Pro > Serial Number: 102242 > Firmware version: 101 > CPLD version: 101 > Date manufactured: 30-4-2002 > U.V. filter ?: No > Measure Ambient ?: No > Tot. Measurement Count: 33915 > Remission Spot Count: 6369 > Remission Scan Count: 1020 > Date of last Remission spot cal: Tue Mar 27 19:21:52 2007 > Remission Spot Count at last cal: 6367 > Total lamp usage: 7555.877930 > RegisterProcess failed (error = -50) > Abort trap You see, dispcal resorts to my EyeOnePro. I guess that's OK. But I am still trapped with the RegisterProcess failed error :( MfG, Roger Breton | Laval, Canada | graxx@xxxxxxxxxxxx http://pages.infinit.net/graxx