Comment 5 for bug 1803917

> but it didn't seem to have any effect on 92.1, 92 or 91

Ideally try with the latest stable version (0.92.3) and make sure to try with a fresh install (i.e. reset preferences as already described and make sure to install into an empty directory).

> only one window is shown in the taskbar and in task manager

The document properties dialog (and others) don't show up as a separate window.

> I also at one point tried only using one screen

That does not help if the document properties dialog was on another screen previously as this is the exact scenario in which dialogs can spawn off screen (i.e. on coordinates that belonged to the now disabled screen which do not lie inside the visible desktop bounds anymore).