GIMP odd behaviour Some parts don't work

[jeanlinux]

(05-27-2024, 09:08 PM)Ofnuts Wrote: Another possibility is that the active "drawable" is not a layer (which is RGB) but some grayscale object, such as a channel (typically, if you Select > Save to channel the active drawable becomes the saved channel until you select back a layer) or a layer mask.

For more clues we would need to see the whole UI (in particular the Layers list and the status bar at the bottom).

Hi,

Well I'm afraid this is getting getting a little too technical for me. 
I enclose a screen capture that might help you see what's wrong with my GIMP.

But as I said earlier I did not temper with any of my photos in any new way. I am doing what I have always done, increase contrast, use curves etc... but now most of the color tools are out of order but for contrast, level and curves. Why should the latter work but not the other ones?

I hope this helps 

,

Jean