GS wrote:

For many years I've assumed that the subject issue, described below, was
a flaw unique to my particular monitors, a succession of iiyama models,
always 1920 x 1200, my preferred resolution.

But I was wrong, because I've just replaced my 24" iiyama Prolite
E2403WS with a 24" Dell U2415 ...and it has exactly the same bizarre
behaviour. If I maximise any window (an application, a folder, whatever)
its size becomes 1936 x 1186 and its position -8, -8.

I use two utilities to report window size/position: AHK Windows Info
1.7, and Macro Express Pro. But I expect there are many more.

Perhaps it only happens with 1920 x 1200 screens? Anyone able to try it
with the more prolific 1920 x 1080 please?

Any insights as to why this occurs? If others with a screen of any
resolution cannot reproduce, what obscure setting of my setup could
cause it?

Terry, East Grinstead, UK

Does both your monitor AND Graphics card support 1920x1200 res? I used to use
that same res many years ago, but the newer hardware & graphics adapters don't
semm to support that anymore.

No graphics card here, my PC uses its built-in Intel HD Graphics 530.

What size are your maximised windows?

Terry, East Grinstead, UK