http://www.mfgg.net/index.php?act=resdb&param=02&c=6&id=29126
You will likely want to download and install this.

This is just a simple fix for that glitch that occurs when you try to toggle Full Screen mode on a game with a video resolution below 640 X 480.
(A replacement really, but just follow me here.)

Plugins required:
MouseKeyboard
Window

You will want to have the Caption, and Menu bars disabled for this to display properly.
This can be controlled with a single global variable.

This can be done with just a few events.
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+ MouseKeyboard: On key <XX> pressed
-> System: Add 1 to global variable 'Window'
Where <XX> is, place the button you wish to use to toggle full screen

+ System: Is global variable 'Window' Greater than 1
-> System: Set global variable 'Window' to 0

+ System: Is global variable 'Window' Equal to 1
-> Window: Maximize window
-> Window: Bring window to top

+ System: Is global variable 'Window' Equal to 0
-> Window: Restore window

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If you have done this right, you should be able to toggle full screen without screwing with your video resolution.