Hi,

I'm using SMB Utility and I'm editing level 1-2 in Super Mario Bros.  My problems are: 

1.  I can't edit most of the objects in the level.  I have changed a lot of blocks to "nothing" and  now when I right-click them and try to change them to something else, they don't change.
2.  I can't navigate to the end of the level no matter what mode I am in.

Note that I removed all of the ground and Mario now just jumps to various platforms.

I may just have this leveled screwed up somehow, I don't know.  If I have to, I wouldn't mind restoring 1-2 back to the way it was originally in the game, as long as I don't lose all the progress I have already made with 1-1.  I don't know how to do that, though.

What can I do?  Please and thank you.

http://www.youtube.com/watch?v=4gLY6sU0bKA

Here is the level.  When I click on a green square, it is one that is "nothing" and I go to edit and change it to "horizontal block" (length: 2) but it doesn't change.  At the end of the level, I keep right clicking and going to "next page", but it won't go.

http://www.savefile.com/files/1531267

Thanks a lot btw, I really appreciate this.

Alright, I think I've got it now.  Thank you.