clCreateContext error on multi-display mode

Hi,
Whenever I run the example codes that depend on the OpenCL/OpenGL interoperability (e.g., oclSimpleGL) on multi-display mode, the function clCreateContext returns the error code CL_OUT_OF_RESOURCES (-5). I’m wondering if this is a bug or just simply the multi-display mode is not supported.

System info:
Windows XP
Nvidia GeForce 9800 GX2

Thanks!
Jian