The saved game is in ~/.quake2/baseq2/save/game and the delete button in the launcher should delete that folder, but I just tested, and seems it's not actually working. I'll be replacing that with the map selection for the next version, so I won't bother even looking into that.. Also, I changed nothing from the last version in the game itsellf that I could remember, so the binary should have been identical, but I suppose I must have done something then. I should probably look into removing that error too, since I'm not changing anything that would affect saving or loading in any way.