I create in game my world:

Game::World.init()
.setObjType(Statics ,OBJ_STATIC )

and fly away areas. When I exit to menu world is deleting (Game::World.del() but when I want to start game again nothing is loadnig. I see only sky and clouds. What I'm doing wrong?

It looks like my application override InitGame because music doesn't change too.

I'm not sure I understand exactly what you mean but I'll give it a go.

Do you have a .New()-line where you load the world-directory?
Like this:

Game::World.init()
.setObjType(Statics ,OBJ_STATIC )
.New("Data/world/test.world")

When you call the .del() function everything you previously loaded is removed, so anything you did earlier would have to be done again.

Yes I have this. I found now that world is loading but without player (all things which is after if(Players.elms()) doesn't show like gui etc). Maybe I show you some screens:

1. I load world:
1
2. I fly somewhere to not to be over world areas:
2
3. I back to menu and start new game:
3

maybe you just have the camera too far away, so when you load the world 2nd time, the player is too far away from camera and isn't loaded

Reseting camera position to 0 could be good solution?

you can try that

It doesn't help.