FOSS gamedev and creative worlds

Hey! Sorry to bother you with this, but I'm having problems with saving.
I exit to the Main Menu and return to my game, but the blocks that I place won't be there.
But I'll be in the same place.
Anybody have any idea what's going on, and if you do could you help me?

Thank You,
EveTheDragoness

The topic below should provide a fix for that.
http://forum.minetest.net/viewtopic.php?id=6311