I recently upgraded video card drivers in windows 7 and it caused full screen mode in 0.50 to stop working. Turning it on caused my monitor to go blank and show a message indicating the display mode was not supported, but Livan still worked.
The problem was solved by replacing the file SDL.dll in the game's main directory with the newer version of SDL.dll included in Livan.
If anyone is having problems with full screen in windows, I hope this might help. It looks like our beloved IVAN is starting to show it's age