Couldn't get this to work, it crashes as it enters the world (during the intro). I had to actually repack the levels to even get past the intro. I bet I tweaked a setting wrong in my forest.chapter or something. I could pastebin it if anyone cares.
If I had to guess, you probably deleted something you weren't supposed to. You can pastebin if you want. What's the error it gives?

I get a minidump error on the intro screen when I try to launch the world when repacking, but it gives a different error if I do a vanilla level then do my edited one. If I leave it in the folders and use the blank gamedata, I get an error 3 trying to launch the opening screen. Me pastebin thingy:
http://pastebin.com/BrUKceKT . I used the Ogmo custom level (40 levels in total! Yowzers!).