Globulation2

I went to the settings and enabled full screen (1200x800) and openGL. I exited the game and launched it again, after it loaded all I see is a black screen. I can still hear the music, but I can't see anything.

check ~/.glob2/preferences.txt to get back to normal.
deleting the lines:
screenFlags=9
optionFlags=1
or the whole file should do the trick.