I got some crash report from a user who using v002 Open Kinect Beta 4 on 10.6.8 with CoGe. I have no chance to test it myself because my Kinect is not at home yet, but I found some lines on the report which may helps:
-[v002_Open_KinectPlugIn selectedResolutionDepth]: unrecognized selector sent to instance 0x502fbb90
-[v002_Open_KinectPlugIn vRGB]: unrecognized selector sent to instance 0x1ac27b90
I already noticed the user have multiple version of the plugin installed, so maybe this is the problem.