Unset the static $scale variable so a new scale can later be set.

modules/farm/farm_map/farm_map.geo.inc

@@ -46,6 +46,11 @@ function farm_map_set_bcscale($reset = FALSE) {
 
     // Otherwise, reset.
     bcscale($scale);
+
+    // Unset the $scale variable so that a new scale can later be set.
+    // Note that we can't use unset() because this is a static variable.
+    $scale = NULL;
+
     return;
   }