--- a/src/base58.h
+++ b/src/base58.h
@@ -288,7 +288,7 @@
 
     bool IsValid() const
     {
-        int nExpectedSize = 20;
+        unsigned int nExpectedSize = 20;
         bool fExpectTestNet = false;
         switch(nVersion)
         {

--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -203,7 +203,7 @@
             // Help text is returned in an exception
             string strHelp = string(e.what());
             if (strCommand == "")
-                if (strHelp.find('\n') != -1)
+                if (strHelp.find('\n') != string::npos)
                     strHelp = strHelp.substr(0, strHelp.find('\n'));
             strRet += strHelp + "\n";
         }

--- a/src/crypter.cpp
+++ b/src/crypter.cpp
@@ -31,7 +31,7 @@
         i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
                           (unsigned char *)&strKeyData[0], strKeyData.size(), nRounds, chKey, chIV);
 
-    if (i != WALLET_CRYPTO_KEY_SIZE)
+    if (i != (int)WALLET_CRYPTO_KEY_SIZE)
     {
         memset(&chKey, 0, sizeof chKey);
         memset(&chIV, 0, sizeof chIV);

--- a/src/irc.cpp
+++ b/src/irc.cpp
@@ -108,13 +108,13 @@
         if (!RecvLineIRC(hSocket, strLine))
             return 0;
         printf("IRC %s\n", strLine.c_str());
-        if (psz1 && strLine.find(psz1) != -1)
+        if (psz1 && strLine.find(psz1) != string::npos)
             return 1;
-        if (psz2 && strLine.find(psz2) != -1)
+        if (psz2 && strLine.find(psz2) != string::npos)
             return 2;
-        if (psz3 && strLine.find(psz3) != -1)
+        if (psz3 && strLine.find(psz3) != string::npos)
             return 3;
-        if (psz4 && strLine.find(psz4) != -1)
+        if (psz4 && strLine.find(psz4) != string::npos)
             return 4;
     }
 }

--- a/src/key.h
+++ b/src/key.h
@@ -173,7 +173,7 @@
 
     CPrivKey GetPrivKey() const
     {
-        unsigned int nSize = i2d_ECPrivateKey(pkey, NULL);
+        int nSize = i2d_ECPrivateKey(pkey, NULL);
         if (!nSize)
             throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
         CPrivKey vchPrivKey(nSize, 0);
@@ -196,7 +196,7 @@
 
     std::vector<unsigned char> GetPubKey() const
     {
-        unsigned int nSize = i2o_ECPublicKey(pkey, NULL);
+        int nSize = i2o_ECPublicKey(pkey, NULL);
         if (!nSize)
             throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
         std::vector<unsigned char> vchPubKey(nSize, 0);

--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2141,7 +2141,18 @@
 {
     switch (inv.type)
     {
-    case MSG_TX:    return mapTransactions.count(inv.hash) || mapOrphanTransactions.count(inv.hash) || txdb.ContainsTx(inv.hash);
+    case MSG_TX:
+        {
+        bool txInMap = false;
+        CRITICAL_BLOCK(cs_mapTransactions)
+        {
+            txInMap = (mapTransactions.count(inv.hash) != 0);
+        }
+        return txInMap ||
+               mapOrphanTransactions.count(inv.hash) ||
+               txdb.ContainsTx(inv.hash);
+        }
+
     case MSG_BLOCK: return mapBlockIndex.count(inv.hash) || mapOrphanBlocks.count(inv.hash);
     }
     // Don't know what it is, just say we already got one
@@ -2806,7 +2817,7 @@
 
 bool SendMessages(CNode* pto, bool fSendTrickle)
 {
-    CRITICAL_BLOCK(cs_main)
+    TRY_CRITICAL_BLOCK(cs_main)
     {
         // Don't send anything until we get their version message
         if (pto->nVersion == 0)

--- a/src/net.cpp
+++ b/src/net.cpp
@@ -159,14 +159,14 @@
                 }
                 if (pszKeyword == NULL)
                     break;
-                if (strLine.find(pszKeyword) != -1)
+                if (strLine.find(pszKeyword) != string::npos)
                 {
                     strLine = strLine.substr(strLine.find(pszKeyword) + strlen(pszKeyword));
                     break;
                 }
             }
             closesocket(hSocket);
-            if (strLine.find("<") != -1)
+            if (strLine.find("<") != string::npos)
                 strLine = strLine.substr(0, strLine.find("<"));
             strLine = strLine.substr(strspn(strLine.c_str(), " \t\n\r"));
             while (strLine.size() > 0 && isspace(strLine[strLine.size()-1]))

--- a/src/net.h
+++ b/src/net.h
@@ -120,7 +120,7 @@
     int64 nLastRecv;
     int64 nLastSendEmpty;
     int64 nTimeConnected;
-    unsigned int nHeaderStart;
+    signed int nHeaderStart;
     unsigned int nMessageStart;
     CAddress addr;
     int nVersion;

--- a/src/qt/csvmodelwriter.cpp
+++ b/src/qt/csvmodelwriter.cpp
@@ -6,7 +6,7 @@
 
 CSVModelWriter::CSVModelWriter(const QString &filename, QObject *parent) :
     QObject(parent),
-    filename(filename)
+    filename(filename), model(0)
 {
 }
 

--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -198,10 +198,12 @@
             settings.setValue("nDisplayUnit", nDisplayUnit);
             emit displayUnitChanged(unit);
             }
+            break;
         case DisplayAddresses: {
             bDisplayAddresses = value.toBool();
             settings.setValue("bDisplayAddresses", bDisplayAddresses);
             }
+            break;
         default:
             break;
         }

--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -59,9 +59,11 @@
 {
     if(!model)
         return;
-    // Fill in label from address book, if no label is filled in yet
-    if(ui->addAsLabel->text().isEmpty())
-        ui->addAsLabel->setText(model->getAddressTableModel()->labelForAddress(address));}
+    // Fill in label from address book, if address has an associated label
+    QString associatedLabel = model->getAddressTableModel()->labelForAddress(address);
+    if(!associatedLabel.isEmpty())
+        ui->addAsLabel->setText(associatedLabel);
+}
 
 void SendCoinsEntry::setModel(WalletModel *model)
 {

--- a/src/uint256.h
+++ b/src/uint256.h
@@ -8,6 +8,7 @@
 #include "serialize.h"
 
 #include <limits.h>
+#include <stdio.h>
 #include <string>
 #include <vector>