writing to Image obtained via CL/GL

Is it possible yet to write to an image that’s been obtained via clCreateFromGLTexture2D?

I get an error -30 (CL_INVALID_VALUE) when I try writing to it with clWriteImage or clEnqueueNDRangeKernel (after acquiring it), but writing to an image that’s been created with clCreateImage2D works ok. Writing to buffers acquired from OpenGL works ok too.

Am I missing some extra step needed, or is it just not supported yet?

If it’s not supported, is there a list of the current issues in NVidia’s OpenCL implementation?