End of my problem: I installed Poser 13 and now everything is fine.

Thank you for reading and thank you for your advice!

I just discovered that if I reduce the size of certain windows, the display returns to 'almost' normal. But functions like 'Render', 'Save the picture' remain invisible...

My version of Poser is 12.0.757.

This is what happens when, for example, I click on 'Hierarchy Window'. Pieces of the window appear all over the screen!

The 'Parameters Dials' window no longer displays the 'X Y Z' dials. They are there but invisible.

All indications at the head of the 'preview window' are now also invisible.

If I resize the window, what should be at the bottom now appears at the top of the window!

I modified the value of 'General Preferences \ Interface \ UI Scale': At the next start, windows are displayed larger or smaller depending on the value entered but the display malfunctions still persist.

Is version 13 my only hope?

Thank again for your answers !

It's Poser 12 that I use on a 27-inch Retina 5k iMac. Since installing Apple's "Sonoma 14.0" update, several Poser 12 windows, such as the Hierarchy Editor, Settings Dials, and the main window header now display incomplete. It is no longer possible to use the program ! Has anyone encountered these issues? Can we hope for corrections?