[benald]

I have calibrated my monitor with Colorvision Spyder (Optical). Because of that, Adobe Gamma is de-installed. Until last week everything worked fine. My system was using Adobe RGB 1998 as it's working space.

Now all images being loaded into Photoshop or Photoshop Elements show a severe color cast on screen.
It doesn't make any difference which profile I select in Color Settings. Adobe RGB, sRGB or Color Match all show a severe color cast. When the images are loaded into viewers outside of the Photoshop environment (for instance ACDSee), all the images appear normal on screen.

Only when I turn color management off, the images in the browser and those loaded into Photoshop appear normal.

Does anyone have a clue what has happened to my system?

[Vikki]

Have you checked the "Advanced" color settings in photoshop? Perhaps you have it set to automatically convert images to some other profile when opening.

[benald]

Thank you Vikki, but I checked that one.

The default setting is that embedded profiles should be preserved.