Not sure if you missed the screenshot I put in a separate post, or if you got your changes overwritten. In the meantime, that cliff in Swamptown and the ship dock at Delta look good to me now.
Edit: I'm going to double check by going up to Snow Town because there's a chance the level is cached and that's what I might be seeing.
Okay, double checked and I still don't know whether there's a cache issue there. I guess you can find out.
Found a bunch more cliff tiling errors in Snow Town though. Also, for some reason, the tileset for Snow Town didn't load for me.