Black & White Raw Images are Automatically Colorized -- Why?

I am using a Lumix GF1 and shooting in black & white and raw.  I have the latest Adobe Camera Raw Program (5.6, I think), Photoshop CS4 and Bridge.  I upload the images from the camera to my pc using Bridge.  They appear in Brdige one-by-one in black & white.  After the last image, Bridge converts them all to color automatically -- and I can't figure out how to stop it.  Can anyone help me?  This only happens to the raw images, not the jpegs.

There is no such thing as a "black and white raw" image or image file.  The B&W is just a tag in metadata that tells the camera software to show you a b&w image, but the raw file wll always have the full color information.
Camera Raw by design ignores the proprietary b&w tag set by your camera.
You can always convert to grayscale in Camera Raw.

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