i think I've fixed it now. Found info on X-Rite site, about Difficulty connecting X-Rite hardware to third-party software and turning OFF i1Pro in X-Rite Device Services Preference Pane. http://www.xrite.com/product_overview.aspx?ID=1161&Action=support&SupportID=4980 Any way to override this, so you don't have to keep switching on/off? Phil Cruse On 7 Feb 2011, at 15:59, Phil Cruse wrote: > On Intel Mac 10.6.6 Argyll v1.3.2 having problem getting brand new i1Pro > Rev.D connected in chartread or spotread with following error > spotread: Error - Configuring USB port 'usb:/bus26/dev5/ (GretagMacbeth i1 > Pro)' to 1 failed with -4 (No such device (it may have been disconnected)) > or after switching ports: > chartread: Error - Configuring USB port 'usb:/bus29/dev2/ (GretagMacbeth i1 > Pro)' to 1 failed with -4 (No such device (it may have been disconnected)) > > Have tried 2 USB ports, one on computer, other in powered USB hub. Works OK > with XRite apps, which are not running at same time as Argyll. Argyll worked > well with old DTP41 for several months. > i!Pro works well on old G4 PowerBook, without errors. The G4 also has had the > XRite apps running. > > Phil Cruse >