Ok so again I'm making a mod with a new worldspace and city. But now, I create the new worldspace and have it all done in the heightmap editor, but as soon as I add an item to the new worldspace or edit the landscape, (I'm not sure which) whole cells of the Tamriel worldspace disappear, such as the Imperial Waterfront and the Anvil Docks. Is there any way to fix this problem? I really don't want to start a new mod since i've gotten so far, and anyway, It happened the last time too.