Everything is Green in RGB color space in Photoshop CS5 Mac

The image explains it all.
CMYK works fine, but RGB doesn't. The preview (in the channels pane) looks fine though.
Pixelmator had the same problem, but I fixed it by turning off color management in Pixelmator.
My question is, how can I fix this problem in a legal copy of Photoshop CS5 Extended?
My Monitor is a dell e193fp, and am running Mac OS X 10.7.2.
My video card is an ATI Radeon HD 4600, and I have a Mid-08 Mac Pro.

It could be your display profile, or a problem with the video card drivers.
I'd bet on the profile.
Also: RGB is not a colorspace. RGB is a color model, or color mode.  A model or mode describes the number of channels, not the meaning of the channels.
sRGB and Adobe RGB are colorspaces.  A colorspace describes the meaning of the color channels (a specific red, a specific green, a specific blue, a specific white point, a specific tone curve) for a given mode or model.
For a color mode or model, there can be many spaces.

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