Adjusting exposure turn white areas into light blue

Hi All,
During testing the Aperture2 trial I noticed that adjusting the exposure turned pure white area's into a light blue.
It happened with a raw image from an Olympus E-400 that has a white background and is pure white close to a window. Since it was slightly over exposed, I adjusted the exposure to -0.63. The area next to the window turned blue. Editing the same raw file in Lightroom2Beta with the same exposure adjustments gives a perfect result.
Has anyone encountered this effect and maybe even found a cause / solution?
Thx,
Peter

Hi Ultrapix,
As far as I could tell, the color space is only set for export. When editing the raw files I can't set the color space. I looked for a default color space setting, but couldn't find anything. Maybe I don't understand what you meant by 'set Aperture to display using the same colour space (likely sRGB) as Lightroom'
If I adjust the exposure, only the light area changes to light blue. However, I've noticed that the overall picture looks more greenish / blueish in Aperture2 than it does in Lightroom2 even with the same white balance setting. I'm getting the impression that Lightroom is simply better at interpreting the raw file.
I could try to get an acceptable result with other adjustments like you suggested, but I think that both white balance and exposure should work flawlessly in an raw editor like aperture, since they are the most used adjustments in my experience.
Thx,
Peter

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