And a few more that I just realised should be there.

Assets/Scripts/Map Generation/MapManager.cs

@@ -192,21 +192,24 @@ public class MapManager : ScriptableObject
 
     bool checkSegments(MapSection first, MapSection second)
     {
-        Debug.Log("Checking " + first.name + " & " + second.name);
+        Debug.Log("Checking " + first.name + " & " + second.name + ". DiffMin = " + second.difficultyMin + ", DiffMax = " + second.difficultyMax);
         int connections = 0;
         //No more than one link section in a row
         if (first.length == 1 && second.length == 1)
         {
+            Debug.Log("Disqualified: repeated link sections");
             return false;
         }
 
         if (second.difficultyMax < difficulty || second.difficultyMin > difficulty) //Check that we're in the right difficulty range for this section
         {
+            Debug.Log("Disqualified: wrong difficulty");
             return false;
         }
 
         if (second.widthIn < widthMin || second.widthIn > widthMax) //And that it's in the right width range
         {
+            Debug.Log("Disqualified: wrong width");
             return false;
         }