your map name is just the name that shows up in the box below, where it says "watermill" and the display name is the name that appears in the cape. take the "." out of your map name and it should be fine. also -- the next tab is for the heightmap and mask, not the first one.
Hello There ;D
There is Nothing Wrong With Your Game <3!
It's Just The Way You Saved It Hun, The Map Name Is How It Will Be Saved On You're Map Board ((Example - Watermill)) So Save It Under A Name Without Symbols Like "#"".!@$%" and it should work fine, the display name is how it will appear in the cape.