We are seeing some trouble with the JoyWarrior USB sensors (particularly the 24F14) and Windows 8. It appears to be a Microsoft issue, ie somehow they are showing the sensor correctly but the values are all "0" for x/y/z. If you are using Windows 8 or thinking of moving to it, you may want to look into an alternative sensor such as the ONavi or Phidget.com models, which run fun in Windows 8.
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