diff --git a/source/backend/carla_engine.hpp b/source/backend/carla_engine.hpp
index 6f5e76dd5..ea0993e64 100644
--- a/source/backend/carla_engine.hpp
+++ b/source/backend/carla_engine.hpp
@@ -754,12 +754,12 @@ public:
      * Load \a filename session.
      * \note Already loaded plugins are not removed; call removeAllPlugins() first if needed.
      */
-    void loadProject(const char* const filename);
+    bool loadProject(const char* const filename);
 
     /*!
      * Save current session to \a filename.
      */
-    void saveProject(const char* const filename);
+    bool saveProject(const char* const filename);
 
     // -------------------------------------------------------------------
     // Information (base)
diff --git a/source/backend/engine/carla_engine.cpp b/source/backend/engine/carla_engine.cpp
index 080776224..639b72a53 100644
--- a/source/backend/engine/carla_engine.cpp
+++ b/source/backend/engine/carla_engine.cpp
@@ -953,7 +953,7 @@ void CarlaEngine::__bridgePluginRegister(const unsigned short id, CarlaPlugin* c
 // -----------------------------------------------------------------------
 // Information (base)
 
-void CarlaEngine::loadProject(const char* const filename)
+bool CarlaEngine::loadProject(const char* const filename)
 {
     CARLA_ASSERT(filename != nullptr);
 
@@ -963,9 +963,10 @@ void CarlaEngine::loadProject(const char* const filename)
     //    return;
 
     //getSaveStateDictFromXML
+    return true;
 }
 
-void CarlaEngine::saveProject(const char* const filename)
+bool CarlaEngine::saveProject(const char* const filename)
 {
     CARLA_ASSERT(filename != nullptr);
 
@@ -991,6 +992,8 @@ void CarlaEngine::saveProject(const char* const filename)
     out << "</CARLA-PRESET>\n";
 
     file.close();
+
+    return true;
 }
 
 // -----------------------------------------------------------------------
diff --git a/source/backend/engine/carla_engine_osc.cpp b/source/backend/engine/carla_engine_osc.cpp
index 99846cb4c..af75e606c 100644
--- a/source/backend/engine/carla_engine_osc.cpp
+++ b/source/backend/engine/carla_engine_osc.cpp
@@ -66,7 +66,7 @@ void CarlaEngineOsc::init(const char* const name)
         {
             fServerPathTCP  = tmpServerPathTCP;
             fServerPathTCP += fName;
-            free(tmpServerPathTCP);
+            std::free(tmpServerPathTCP);
         }
 
         lo_server_add_method(fServerTCP, nullptr, nullptr, osc_message_handler, this);
@@ -80,7 +80,7 @@ void CarlaEngineOsc::init(const char* const name)
         {
             fServerPathUDP  = tmpServerPathUDP;
             fServerPathUDP += fName;
-            free(tmpServerPathUDP);
+            std::free(tmpServerPathUDP);
         }
 
         lo_server_add_method(fServerUDP, nullptr, nullptr, osc_message_handler, this);
@@ -367,23 +367,25 @@ int CarlaEngineOsc::handleMsgRegister(const int argc, const lo_arg* const* const
         return 1;
     }
 
-    const char* const url = (const char*)&argv[0]->s;
-    const char* host;
-    const char* port;
+    const char* const url = &argv[0]->s;
 
     qDebug("CarlaEngineOsc::handleMsgRegister() - OSC backend registered to %s", url);
 
-    host = lo_address_get_hostname(source);
-    port = lo_address_get_port(source);
-    fControlData.source = lo_address_new_with_proto(LO_TCP, host, port);
+    {
+        const char* host = lo_address_get_hostname(source);
+        const char* port = lo_address_get_port(source);
+        fControlData.source = lo_address_new_with_proto(LO_TCP, host, port);
+    }
 
-    host = lo_url_get_hostname(url);
-    port = lo_url_get_port(url);
-    fControlData.path   = lo_url_get_path(url);
-    fControlData.target = lo_address_new_with_proto(LO_TCP, host, port);
+    {
+        char* host = lo_url_get_hostname(url);
+        char* port = lo_url_get_port(url);
+        fControlData.path   = carla_strdup_free(lo_url_get_path(url));
+        fControlData.target = lo_address_new_with_proto(LO_TCP, host, port);
 
-    free((void*)host);
-    free((void*)port);
+        std::free(host);
+        std::free(port);
+    }
 
     for (unsigned short i=0; i < kEngine->currentPluginCount(); i++)
     {
diff --git a/source/backend/plugin/carla_plugin.cpp b/source/backend/plugin/carla_plugin.cpp
index 040829497..5676a4c86 100644
--- a/source/backend/plugin/carla_plugin.cpp
+++ b/source/backend/plugin/carla_plugin.cpp
@@ -1005,25 +1005,28 @@ void CarlaPlugin::updateOscData(const lo_address& source, const char* const url)
     // FIXME - remove debug prints later
     qWarning("CarlaPlugin::updateOscData(%p, \"%s\")", source, url);
 
-    const char* host;
-    const char* port;
-    const int proto = lo_address_get_protocol(source);
-
     kData->osc.data.free();
 
-    host = lo_address_get_hostname(source);
-    port = lo_address_get_port(source);
-    kData->osc.data.source = lo_address_new_with_proto(proto, host, port);
-    qWarning("CarlaPlugin::updateOscData() - source: host \"%s\", port \"%s\"", host, port);
+    const int proto = lo_address_get_protocol(source);
+
+    {
+        const char* host = lo_address_get_hostname(source);
+        const char* port = lo_address_get_port(source);
+        kData->osc.data.source = lo_address_new_with_proto(proto, host, port);
 
-    host = lo_url_get_hostname(url);
-    port = lo_url_get_port(url);
-    kData->osc.data.path   = lo_url_get_path(url);
-    kData->osc.data.target = lo_address_new_with_proto(proto, host, port);
-    qWarning("CarlaPlugin::updateOscData() - target: host \"%s\", port \"%s\", path \"%s\"", host, port, kData->osc.data.path);
+        qWarning("CarlaPlugin::updateOscData() - source: host \"%s\", port \"%s\"", host, port);
+    }
 
-    free((void*)host);
-    free((void*)port);
+    {
+        char* host = lo_url_get_hostname(url);
+        char* port = lo_url_get_port(url);
+        kData->osc.data.path   = carla_strdup_free(lo_url_get_path(url));
+        kData->osc.data.target = lo_address_new_with_proto(proto, host, port);
+        qWarning("CarlaPlugin::updateOscData() - target: host \"%s\", port \"%s\", path \"%s\"", host, port, kData->osc.data.path);
+
+        std::free(host);
+        std::free(port);
+    }
 
 #ifndef BUILD_BRIDGE
     if (fHints & PLUGIN_IS_BRIDGE)
diff --git a/source/backend/plugin/carla_plugin_internal.hpp b/source/backend/plugin/carla_plugin_internal.hpp
index 5894dfe4f..6ee1122fb 100644
--- a/source/backend/plugin/carla_plugin_internal.hpp
+++ b/source/backend/plugin/carla_plugin_internal.hpp
@@ -279,13 +279,16 @@ struct PluginProgramData {
         if (names != nullptr)
         {
             for (uint32_t i=0; i < count; i++)
-                std::free((void*)names[i]);
+            {
+                if (names[i] != nullptr)
+                    delete[] names[i];
+            }
 
             delete[] names;
             names = nullptr;
         }
 
-        count = 0;
+        count   = 0;
         current = -1;
     }
 
diff --git a/source/backend/standalone/carla_standalone.cpp b/source/backend/standalone/carla_standalone.cpp
index 9dcf42d30..10041ddee 100644
--- a/source/backend/standalone/carla_standalone.cpp
+++ b/source/backend/standalone/carla_standalone.cpp
@@ -303,7 +303,10 @@ bool carla_load_project(const char* filename)
     CARLA_ASSERT(filename != nullptr);
 
     if (standalone.engine != nullptr)
-        standalone.engine->loadProject(filename);
+        return standalone.engine->loadProject(filename);
+
+    standalone.lastError = "Engine is not started";
+    return false;
 }
 
 bool carla_save_project(const char* filename)
@@ -312,7 +315,10 @@ bool carla_save_project(const char* filename)
     CARLA_ASSERT(filename != nullptr);
 
     if (standalone.engine != nullptr)
-        standalone.engine->saveProject(filename);
+        return standalone.engine->saveProject(filename);
+
+    standalone.lastError = "Engine is not started";
+    return false;
 }
 
 // -------------------------------------------------------------------------------------------------------------------
diff --git a/source/bridges/carla_bridge_osc.cpp b/source/bridges/carla_bridge_osc.cpp
index d4459a0fb..742ddfa70 100644
--- a/source/bridges/carla_bridge_osc.cpp
+++ b/source/bridges/carla_bridge_osc.cpp
@@ -82,24 +82,25 @@ bool CarlaBridgeOsc::init(const char* const url)
 
     if (! path)
     {
-        free(host);
+        std::free(host);
         qCritical("CarlaBridgeOsc::init(\"%s\") - failed to get url path", url);
         return false;
     }
 
     if (! port)
     {
-        free(host);
-        free(path);
+        std::free(host);
+        std::free(path);
         qCritical("CarlaBridgeOsc::init(\"%s\") - failed to get url port", url);
         return false;
     }
 
-    m_controlData.path   = path;
+    m_controlData.path   = carla_strdup(path);
     m_controlData.target = lo_address_new_with_proto(LO_TCP, host, port);
 
-    free(host);
-    free(port);
+    std::free(path);
+    std::free(host);
+    std::free(port);
 
     if (! m_controlData.target)
     {
@@ -118,7 +119,7 @@ bool CarlaBridgeOsc::init(const char* const url)
     if (char* const serverUrl = lo_server_get_url(m_server))
     {
         m_serverPath = strdup(QString("%1%2").arg(serverUrl).arg(m_name).toUtf8().constData());
-        free(serverUrl);
+        std::free(serverUrl);
     }
     else
         m_serverPath = strdup(QString("%1carla-bridge").arg(serverUrl).toUtf8().constData());
diff --git a/source/utils/carla_utils.hpp b/source/utils/carla_utils.hpp
index bd5665ec6..e41585e2c 100644
--- a/source/utils/carla_utils.hpp
+++ b/source/utils/carla_utils.hpp
@@ -147,6 +147,14 @@ const char* carla_strdup(const char* const strBuf)
     return buffer;
 }
 
+static inline
+const char* carla_strdup_free(const char* const strBuf)
+{
+    const char* const buffer = carla_strdup(strBuf);
+    std::free((void*)strBuf);
+    return buffer;
+}
+
 // -------------------------------------------------
 // math functions