diff -Nur -Xfreecivdiff.ignore freeciv-cvs/client/climisc.c freeciv-patched/client/climisc.c
--- freeciv-cvs/client/climisc.c	Mon Dec 10 20:18:55 2001
+++ freeciv-patched/client/climisc.c	Mon Dec 10 20:59:29 2001
@@ -154,7 +154,7 @@
  * (Could used signed short, but int is easier and storage here will
  * be fairly small.)
  */
-static int max_cont_used = 0;
+static int max_cont_used = -1;
 static struct athing recyc_conts;   /* .n is number available */
 static int recyc_init = 0;	    /* for first init of recyc_conts */
 static int *recyc_ptr = NULL;	    /* set to recyc_conts.ptr (void* vs int*) */
@@ -168,10 +168,8 @@
     /* initialize with size first time: */
     ath_init(&recyc_conts, sizeof(int));
     recyc_init = 1;
-    update_island_impr_effect(-1,0);
-  } else {
-    update_island_impr_effect(max_cont_used,0);
   }
+  update_island_impr_effect(max_cont_used,0);
   ath_free(&recyc_conts);
   recyc_ptr = NULL;
   max_cont_used = 0;
diff -Nur -Xfreecivdiff.ignore freeciv-cvs/client/packhand.c freeciv-patched/client/packhand.c
--- freeciv-cvs/client/packhand.c	Mon Dec 10 20:18:38 2001
+++ freeciv-patched/client/packhand.c	Mon Dec 10 20:55:57 2001
@@ -557,7 +557,13 @@
     pcity->ppl_angry[4]   = 0;
   }
 
-  if (city_is_new) improvement_status_init(pcity->improvements);
+  if (city_is_new) {
+    /* Initialise list of improvements with City- or Building- equiv_range */
+    improvement_status_init(pcity->improvements);
+
+    /* Initialise city's list of improvement effects */
+    effect_list_init(&pcity->effects);
+  }
 
   if (packet->capital) {
     if (pcity->improvements[B_PALACE]==I_NONE)