In the very latest build, SDL 1.3-5319, fullscreen windows now work far better with OpenGL. However, there is a problem when switching from full-screen mode to windowed mode IF the SDL context was initially created using a fullscreen flag. The problem is that the window has no title bar and can't be moved. Worse, when you switch back to fullscreen, drawing is handled incorrectly.

These problems do NOT happen if the SDL window was initially created *without* the fullscreen flag, and was *later* changed to fullscreen using SDL_SetWindowFullscreen. In this case, we see a window 

The problem possibly stems from the fact that SDL does not know what "size" the window should be when it is NOT fullscreen when it is created to be fullscreen at the outset. I therefore call SDL_SetWindowSize to resize it to be smaller than the entire screen *after* switching out of fullscreen mode, yet... when SDL_SetWindowFullscreen initially did the switch from fullscreen to windowed, it set the "windowed" version to be the same size as the display's resolution... meaning the window's title bar is cut off. I don't know if this has anything to do with the problem or not, just a guess.