I have a problem thats probably so simple to fix but I can't seem to find out how. The problem is when you beat a level, it tries to change the path and mountains and other things just like in the original game, but the problem is that they aren't there anymore so I gust get a bunch of garbled graphics. I would show a screenshot, but I don't know how to.
I had the same problem just last week. It was that I had forgotten to delete the old tiles in the event editor mode. So if you go back and check that all the old tiles in the 8x8/16x16 (don't remember which) EVENT editor mode are removed that should solve that problem.
If you deleted everything in both event editors, try activating the events passed to see if anything else pops up that was hidden before. Delete anything that shows up and if that doesn't work then I'm out of ideas.