Put check around windsave command in python, so only rank0 writes

python.c

@@ -2113,14 +2113,24 @@ run -- 07jul -- ksl
          JM1304: moved geo.wcycle++ after xsignal to record cycles correctly. First cycle is cycle 0. */
       /* NSH1306 - moved geo.wcycle++ back, but moved the log and xsignal statements */
 
-      Log_silent ("Saved wind structure in %s after cycle %d\n", windsavefile,
-	   geo.wcycle);
 
       xsignal (root, "%-20s Finished %d of %d ionization cycle \n", "OK",
 	       geo.wcycle, wcycles);
       geo.wcycle++;		//Increment ionisation cycles
 
+/* NSH 1408 - The wind save command was not inside the ifdef statement, and so many processors tried to access the same file. This is fixed below */
+
+#ifdef MPI_ON
+      if (rank_global == 0)
+      {
+#endif
       wind_save (windsavefile);
+      Log_silent ("Saved wind structure in %s after cycle %d\n", windsavefile,
+	   geo.wcycle);
+#ifdef MPI_ON
+      }
+      MPI_Barrier(MPI_COMM_WORLD);
+#endif
 
 
 
@@ -2312,7 +2322,7 @@ run -- 07jul -- ksl
 
       geo.pcycle++;		// Increment the spectral cycles
 
-#ifdef MPI_ON
+#ifdef MPI_ON    
       if (rank_global == 0)
       {
 #endif