Well, a few days ago, I got the idea to look at the prefs/paths and it showed 2.90. I corrected that to 2.92 and the problem was solved.
But since 2.49, it is the very first time that it occurs. The path was always automatically corrected, it seems.

Thanks for your reply. I did what you said, placing the properties somewhere else and it works, but it changes my screen config and I don't like it. An option would be great !!!

I agree, it should not, but :
I show you a capture{F9169213}

Hi, Philipp. No, then it's okay. I didn't know this preference.
Then, my problem is solved.
Sorry and thank you !

Ok, thanks. I'll do that.

Thanks a lot Ankit, but you can read on the page you linked "These GPU features were added in Windows 10’s Fall Creators Update, also known as Windows 10 version 1709. If you’re using Windows 7, 8, or an older version of Windows 10, you won’t see these tools in your Task Manager."
And I am on W7Pro... Leave it, that's not that important, after all. Concentrate on all the real bugs our wonderful Blender suffers.
Bon courage to all and take care !

Hi, Ankit.
I can't measure GPU on W7. I tried all the apps I found, including Z-GPU. But my 4x2 CPU cores stop well. I have a lot of "fans" (no pun) and I guess that what I hear is not the GPU fan. Well, that's not a bug, and there are so many, don't bother anymore with that... Discard that please.
Thanks anyway for your reply !

blend :

Sorry, no idea. I checked older blends of the same project and it suddenly appeared on a blend. Just thought that it should be prevented in the code to have several values for the same property at a certain time, and I just wanted to share that with you devs.
Good thoughts for the curfew !

Is it normal (I think it's not) to have 4 different keys at the same frame ?

Well, I was checking every object that was concerned, because I guessed that there were double assignments, and it was so, I had parented with CTRL P but the parent indicated was another in the properties. It should work now. Sorry for the inconvenience.
I consider the matter solved.

Windows 7 Blender 2.80 Hash ad707115d5bc
It seems that it's impossible to bake for Cycles, always get reply "No active image found...".
But the baking for Workbench works, so do the baking for Workbench first then it works in Cycles.