A tile Problem

[Windu]

Please, see this. Why are these black lines appearing?

Can someone tell me the path for "dark tiles" in the Black Citadel tileset? (If that is the problem)

 

[ap0calypse]

Try moving the tileset all the way to the left (in the advanced -> modify tileset panel).
This will let your tileset get under all other tilesets (so that border should be gone).

Don't forget to save/re-load the map once this is done!

Edit: didn't see your second request, sorry.
The tileset's path is "TerrainArt\BlackCitadel\Citadel_DarkTiles.blp", although I don't think that is the problem.
If the path was wrong, you wouldn't see the tileset at all.