Preview (and also Quicklook) no longer show certain JPGs

i run latest 10.6.8 software.

It was always that preview and later also quicklook showed all the jpgs i created with Photoshop in CMYK mode with included color profile without any problems.

Now both dont show them anymore.

When trying, this error shows up in the logs: "Malformed Image: too many APP2 markers"

The files themselfes seem to be okay because otherwise they can be opened properly.

aha -> firefox shows them but safari also refuses.

I tried on a friends macbook with also 10.6.8. Same problem there.