in map editor click: import->monsters, npc (ctrl+a and open). Then save map.
I dont think you can get back your spawn. If you did a backup you need to replace it with the one that doesn't work.
When you're "re-mapping" a map you should allways make a backup map/file(s).
Or I don't know maybe you can get your old spawn back but I am telling you what I know 'bout this..:thumbup: