Have you made another map in the game? If that didn't happen then, you might want to test if the game knows it's there. Make a blank map and add a portal to your invisible map in it, then save it under whichever name you wish. Does it show in the Cape? If such, enter it and test out the portal. Does it work there? If such, you might want to try reinstalling... This happened to me about 4 months ago, and reinstalling worked. c: