when I click on "close" to close the plan, I have to confirm by the enter key on the PC and in this case I don't have the question "do you want to save the changes".
Is it a software bug or is it my PC that is playing jokes on me.
I click on close or on the "save" icon and the screen freezes, I unlock it by validating it by the enter key of the PC but in this case no confirmation or non-confirmation of registration possible.
This is also my opinion, I think Fab is right! Maybe you've given a presentation with an overhead projector and the message is now off your screen. (We've all had this kind of inconvenience at least once!)
At any rate, you would have to look in the settings of the graphics card driver... There may be a setting concerning the dual screen, like the extended desktop which is always active... Or try changing the resolution... This sometimes has the effect of refocusing the dialogue boots
Go to "Tools", "options" "advanced" > you will see all the messages where you have checked: "do not ask again". See if you find the message "Do you want to register.... "