From: Hampshire, England
FoF is hardwired at 1024x768 resolution. When the game is launched the code switches the display mode to this, no matter if your Desktop was set higher (or lower?). If your Desktop was set at a higher resolution you are going to have a problem if a background process starts up which wants to use the higher resolution by default. The most obvious one of these is the screen saver, but there are many others such as - security updates, security warnings, Windows updates, Internet checks etc. etc.. Most of us will not want to cancel or change our settings just to play FoF, so there is a problem.
In my experience, if a 'background' process kicks in (most particularly, the screen-saver) there is no way to return the game to full screen. After some experimentation, it seems the only way around this is to set the Desktop resolution to 1024x768 before launching the game and, if required, resetting it to what you want after exiting.
This seems to work after a few tests.
'Maa'm, it'll ram your anklebones into your asshole'
Explanation of 'groundshock' to an annoyingly Politically Correct woman on viewing the Sedan crater at the Nuclear Test Site in Nevada.