Unable to fullscreen

I set the window size to be 640x480 and when i went into full screen mode for 4:3 ratio mode, the window doesn’t fill up the screen fully. Help?

Help? :frowning:

What do you mean when it doesn’t fill up the screen fully? Can you still see the rest of your screen (windows behind your game) or it is black?
On which OS are you working?
Fullscreen action will try to fill completely your screen and will probably have some trouble if the resolution of your game is not a multiple of your screen resolution. I mean, the ratio will be destroyed (or maybe not, I don’t really test that).