diff --git a/src/mint-lib/mint_api_refresh.c b/src/mint-lib/mint_api_refresh.c
index 3e50047bb..92535263a 100644
--- a/src/mint-lib/mint_api_refresh.c
+++ b/src/mint-lib/mint_api_refresh.c
@@ -1951,19 +1951,19 @@ TALER_MINT_refresh_reveal (struct TALER_MINT_Handle *mint,
 
   /* build array of transfer private keys */
   transfer_privs = json_array ();
-  for (i=0;i<md->num_melted_coins;i++)
+  for (j=0;j<TALER_CNC_KAPPA;j++)
   {
-    const struct MeltedCoin *mc = &md->melted_coins[i];
-
-    tmp = json_array ();
-    for (j=0;j<TALER_CNC_KAPPA;j++)
+    if (j == noreveal_index)
     {
-      if (j == noreveal_index)
-      {
-        /* This is crucial: exclude the transfer key for the
-           noreval index! */
-        continue;
-      }
+      /* This is crucial: exclude the transfer key for the
+	 noreval index! */
+      continue;
+    }
+    tmp = json_array ();
+    for (i=0;i<md->num_melted_coins;i++)
+    {
+      const struct MeltedCoin *mc = &md->melted_coins[i];
+
       json_array_append (tmp,
                          TALER_json_from_data (&mc->transfer_priv[j],
                                                sizeof (struct TALER_TransferPrivateKeyP)));
diff --git a/src/mint-lib/test_mint_api.c b/src/mint-lib/test_mint_api.c
index 19b50373b..bbe81d5a4 100644
--- a/src/mint-lib/test_mint_api.c
+++ b/src/mint-lib/test_mint_api.c
@@ -684,6 +684,7 @@ withdraw_status_cb (void *cls,
                 http_status,
                 cmd->label);
     GNUNET_break (0);
+    json_dumpf (json, stderr, 0);
     fail (is);
     return;
   }
@@ -792,6 +793,7 @@ withdraw_sign_cb (void *cls,
                 "Unexpected response code %u to command %s\n",
                 http_status,
                 cmd->label);
+    json_dumpf (full_response, stderr, 0);
     GNUNET_break (0);
     fail (is);
     return;
@@ -846,6 +848,7 @@ deposit_cb (void *cls,
                 "Unexpected response code %u to command %s\n",
                 http_status,
                 cmd->label);
+    json_dumpf (obj, stderr, 0);
     fail (is);
     return;
   }
@@ -881,6 +884,7 @@ melt_cb (void *cls,
                 "Unexpected response code %u to command %s\n",
                 http_status,
                 cmd->label);
+    json_dumpf (full_response, stderr, 0);
     fail (is);
     return;
   }
@@ -922,6 +926,7 @@ reveal_cb (void *cls,
                 "Unexpected response code %u to command %s\n",
                 http_status,
                 cmd->label);
+    json_dumpf (full_response, stderr, 0);
     fail (is);
     return;
   }
@@ -987,6 +992,7 @@ link_cb (void *cls,
                 "Unexpected response code %u to command %s\n",
                 http_status,
                 cmd->label);
+    json_dumpf (full_response, stderr, 0);
     fail (is);
     return;
   }
diff --git a/src/mint/taler-mint-httpd_refresh.c b/src/mint/taler-mint-httpd_refresh.c
index fcd843083..16fe3557f 100644
--- a/src/mint/taler-mint-httpd_refresh.c
+++ b/src/mint/taler-mint-httpd_refresh.c
@@ -794,6 +794,7 @@ handle_refresh_reveal_json (struct MHD_Connection *connection,
                                      TMH_PARSE_JNC_RET_DATA,
                                      &transfer_privs[i][j],
                                      sizeof (struct TALER_TransferPrivateKeyP));
+      GNUNET_break_op (GNUNET_OK == res);
     }
   }
   if (GNUNET_OK != res)
@@ -859,13 +860,16 @@ TMH_REFRESH_handler_refresh_reveal (struct TMH_RequestHandler *rh,
                              spec);
   json_decref (root);
   if (GNUNET_OK != res)
+  {
+    GNUNET_break_op (0);
     return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
-
+  }
   /* Determine dimensionality of the request (kappa and #old coins) */
   /* Note we do +1 as 1 row (cut-and-choose!) is missing! */
   if (TALER_CNC_KAPPA != json_array_size (transfer_privs) + 1)
   {
     TMH_PARSE_release_data (spec);
+    GNUNET_break_op (0);
     return TMH_RESPONSE_reply_arg_invalid (connection,
                                            "transfer_privs");
   }
@@ -878,6 +882,7 @@ TMH_REFRESH_handler_refresh_reveal (struct TMH_RequestHandler *rh,
   if (GNUNET_OK != res)
   {
     TMH_PARSE_release_data (spec);
+    GNUNET_break_op (0);
     return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
   }
   num_oldcoins = json_array_size (reveal_detail);