There have been a few customers report one or more of the following issues:

1. Monitor calibrator (i.e., i1Display Pro, ColorMunki Display, i1Pro) fails to connect to Mac that has a Thunderbolt-connected display.
2. Monitor calibrator (i.e., i1Display Pro, ColorMunki Display, i1Pro) connects fine to iMac or MacBook Pro running OSX 10.6 or higher.
3. Customer has successfully profiled the iMac or MacBook Pro prior to connecting a new Apple Thunderbolt Display.
4. Customer connects the Thunderbolt Display and then the X-Rite calibration application (ColorMunki Display or i1Profiler) fails to recognize the measurement device.

If the user has connected an X-Rite device to a Thunderbolt display and now the X-Rite profiling software fails to see the device, please follow these steps:

1. Unplug the monitor calibrator
2. Download and install X-Rite Device Services (XRD) 2.2.0 from the following link: http://www.xrite.com/product_overview.aspx?ID=1509&Action=support&SoftwareID=1167
3. Reboot the computer, plug in the monitor calibrator, and test

If XRD 2.2.0 does not resolve the problem, please follow these steps in EXACT order:

If the Thunderbolt display is the only display connected to a Mac Mini or MacPro, simply connect the X-Rite device directly to the computer (NOT to the display) and reboot the computer to re-establish connection.

If the Thunderbolt display is part of a multiple display system, follow these steps:

1. Disconnect the Thunderbolt Display
2. KEEP THE MEASUREMENT DEVICE (i.e., i1Display Pro, ColorMunki Display, i1Pro) PLUGGED INTO THE COMPUTER!
3. Reboot the computer,
4. The device should work on the iMac or MacBook Pro.

To profile the Thunderbolt Display, follow these additional steps:

1. Thunderbolt Display should be disconnected.
2. KEEP THE MEASUREMENT DEVICE (i.e., i1Display Pro, ColorMunki Display, i1Pro) PLUGGED INTO THE COMPUTER!
3. Shut down the computer.
4. Connect the Thunderbolt Display to the computer once the computer is completely shut down.

Start up the computer and the device should work fine for either display.