With the release of v10.4.10, Apple has significantly changed the USB architecture. Apple forums describe a wide variety of USB issues as a result. While you may elect to downgrade your Apple to v10.4.9, you may alternately wish to upgrade your i1Match SW.
X-Rite recently released v3.6.2 in which we now support Vista 32 and 64-bit systems. In addition, the USB drivers were completely rewritten (to be compliant for Intel Macs and Windows Vista). Maybe, the re-designed drivers help to work around the issues with MacOS 10.4.10.
You will find the i1Match SW at the following location: