Map graphics error and wrong location name

Thanks a lot! I've changed byte 17 with your new editor version, and it worked! I looked through other maps to see if I can recognize a pattern for byte 17, and then chose a value that is also used by most caves that use similar tilesets, and that seems to have done the trick.

On a side note, I once had trouble when using the warp spell to escape from my custom dungeon, I landed on a completely different place of the world map, unable to reach my airship again. This issue was solved when I set the unknown bit 3.1 for my exit. I did a bit of testing by clearing bit 3.1 from a few world map exits, and found that without this bit, returning to the world map became messed up. So I guess that this unknown bit 3.1. seems to be needed for having the warp spell work correctly (perhaps the spell 'remembers' the last exit that had bit 3.1 set, and warps you there?). Can you confirm this?