exiftoolgui 4.17, win xp sp3.
If I move around the file list (middle pane) using pgup/pgdn, the selected file changes, but the data displayed for the file in the right pane (looking at "quick") does not change. However, moving around by uparrow/dnarrow does cause properties to reflect the selected file, as does selection by mouse click. For pgup/pgdn, either the properties should change to reflect the currently highlighted file in the file list, or else the file should not be highlighted, but perhaps simply show a focus change with a gray box or something like that around it. (But imho, it's better to reflect it in the right pane properties.) Note, I am observing this while in "details" and "about image" center pane mode.
As it seems, I've missed PgDown/Up buttons. Thank you for posting.
Bogdan