diff --git a/src/main.cpp b/src/main.cpp
index 670aa299c..632504ad3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1014,7 +1014,8 @@ bool ContextualCheckTransaction(
     // If Sprout rules apply, reject transactions which are intended for Overwinter and beyond
     if (isSprout && tx.fOverwintered) {
         return state.DoS(isInitBlockDownload() ? 0 : dosLevel,
-                         error("ContextualCheckTransaction(): overwinter is not active yet"),
+                         error("ContextualCheckTransaction(): ht.%d activates.%d dosLevel.%d overwinter is not active yet",
+                               nHeight, Params().GetConsensus().vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight, dosLevel),
                          REJECT_INVALID, "tx-overwinter-not-active");
     }
 
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index b57cef4e3..ddac8f782 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1495,9 +1495,15 @@ bool VerifyScript(
         // serror is set
         return false;
     if (stack.empty())
+    {
+        //printf("interpreter stack is empty, comment this debugging message\nscriptSig: %s\nscriptPubKey: %s",scriptSig.ToString().c_str(),scriptPubKey.ToString().c_str());
         return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+    }
     if (CastToBool(stack.back()) == false)
+    {
+        //printf("false return value, comment this debugging message\nscriptSig: %s\nscriptPubKey: %s",scriptSig.ToString().c_str(),scriptPubKey.ToString().c_str());
         return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+    }
 
     // Additional validation for spend-to-script-hash transactions:
     if ((flags & SCRIPT_VERIFY_P2SH) && scriptPubKey.IsPayToScriptHash())
@@ -1522,9 +1528,15 @@ bool VerifyScript(
             // serror is set
             return false;
         if (stack.empty())
+        {
+            //printf("interpreter stack is empty #2, comment this debugging message\nscriptSig: %s\nscriptPubKey: %s",scriptSig.ToString().c_str(),scriptPubKey.ToString().c_str());
             return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+        }
         if (!CastToBool(stack.back()))
+        {
+            //printf("false return value #2, comment this debugging message\nscriptSig: %s\nscriptPubKey: %s",scriptSig.ToString().c_str(),scriptPubKey.ToString().c_str());
             return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+        }
     }
 
     // The CLEANSTACK check is only performed after potential P2SH evaluation,
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 534d8fe81..83209abed 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -3457,7 +3457,7 @@ UniValue z_getnewaddress(const UniValue& params, bool fHelp)
 
     bool allowSapling = (Params().GetConsensus().vUpgrades[Consensus::UPGRADE_SAPLING].nActivationHeight <= chainActive.LastTip()->GetHeight());
 
-    std::string defaultType = allowSapling ? ADDR_TYPE_SAPLING : ADDR_TYPE_SPROUT;
+    std::string defaultType = ADDR_TYPE_SPROUT;
 
     if (fHelp || params.size() > 1)
         throw runtime_error(