White color of RGB image changes when exporting to CMYK PDF

I'm used to work as long as possible in RGB. Even my images placed in InDesign stay in RGB. I only convert to CMYK while exporting to PDF. This always worked fine. I now noticed that RGB images with a white background changed in the CMYK PDF.
The white wasn't white any more, but C=1/M=1/Y=1/K=0 !
Result is a very light-grey background when printed on an offset press.
If I convert the image to CMYK in Photoshop first, I don't have this problem. I always thought InDesign and Photoshop used the same conversion-tool? Guess not ...
I didn't have this problem in CS2, I think. So my guess is it got something to do with CS3, but I'm not sure.
Someone got an idea?
I use Adobe creative Suite CS3 5.0.4
Mac Os 10.5.5
Color Management is set to European Prepress (I already tried to change this --> no effect)

I've noticed that there are slight variations between Photoshop and ID, but I think it's just a rounding error. Photoshop's CMYK readouts are always integers, while ID swatches can readout numbers. So obviously it's possible to output 1.67% cyan, but Photoshop's info readout rounds that up to 2%. Try making an 253|253|253 RGB swatch in ID, then open Swatch Options and convert the swatch mode to CMYK. You'll get a conversion something like .78|.39|.39|0 depending on your profiles, yet the Separation Preview reads out 1|0|0|0 with the total ink as 2%.

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