diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4fc91c10..339e633a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,7 @@ endif()
 
 # Global compile flags
 # These are specific to GCC/MinGW; for other compilers, change as necessary
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=c++11")
 set(CMAKE_CXX_FLAGS_RELEASE "-O2")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
diff --git a/src/CBot/tests/CBot_console/CMakeLists.txt b/src/CBot/tests/CBot_console/CMakeLists.txt
index 9f0f2444..f76dedf4 100644
--- a/src/CBot/tests/CBot_console/CMakeLists.txt
+++ b/src/CBot/tests/CBot_console/CMakeLists.txt
@@ -8,7 +8,6 @@ if(NOT CMAKE_BUILD_TYPE)
 endif(NOT CMAKE_BUILD_TYPE)
 
 # Global compile flags
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
 set(CMAKE_CXX_FLAGS_RELEASE "-O2")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
diff --git a/src/app/app.cpp b/src/app/app.cpp
index faf45268..4a696553 100644
--- a/src/app/app.cpp
+++ b/src/app/app.cpp
@@ -1520,7 +1520,16 @@ void CApplication::SetLanguage(Language language)
     if (locale.empty())
     {
         char *envLang = getenv("LANGUAGE");
-        if (strncmp(envLang,"en",2) == 0)
+        if (envLang == NULL)
+        {
+            envLang = getenv("LANG");
+        }
+        if (envLang == NULL)
+        {
+            GetLogger()->Error("Failed to get language from environment, setting default language");
+            m_language = LANGUAGE_ENGLISH;
+        }
+        else if (strncmp(envLang,"en",2) == 0)
         {
            m_language = LANGUAGE_ENGLISH;
         }
@@ -1532,7 +1541,7 @@ void CApplication::SetLanguage(Language language)
         {
            m_language = LANGUAGE_FRENCH;
         }
-        else if (strncmp(envLang,"po",2) == 0)
+        else if (strncmp(envLang,"pl",2) == 0)
         {
            m_language = LANGUAGE_POLISH;
         }
diff --git a/src/common/test/CMakeLists.txt b/src/common/test/CMakeLists.txt
index 26a31c9b..70dac1f2 100644
--- a/src/common/test/CMakeLists.txt
+++ b/src/common/test/CMakeLists.txt
@@ -3,7 +3,6 @@ cmake_minimum_required(VERSION 2.8)
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE debug)
 endif(NOT CMAKE_BUILD_TYPE)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
 include_directories(
diff --git a/src/graphics/engine/test/CMakeLists.txt b/src/graphics/engine/test/CMakeLists.txt
index f2db1527..afaa86a2 100644
--- a/src/graphics/engine/test/CMakeLists.txt
+++ b/src/graphics/engine/test/CMakeLists.txt
@@ -3,7 +3,6 @@ cmake_minimum_required(VERSION 2.8)
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE debug)
 endif(NOT CMAKE_BUILD_TYPE)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
 set(MODELFILE_TEST_SOURCES
diff --git a/src/graphics/opengl/test/CMakeLists.txt b/src/graphics/opengl/test/CMakeLists.txt
index 154fec84..79e0ba56 100644
--- a/src/graphics/opengl/test/CMakeLists.txt
+++ b/src/graphics/opengl/test/CMakeLists.txt
@@ -8,7 +8,6 @@ find_package(PNG REQUIRED)
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE debug)
 endif(NOT CMAKE_BUILD_TYPE)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
 set(ADD_LIBS "")
diff --git a/src/math/test/CMakeLists.txt b/src/math/test/CMakeLists.txt
index dae40188..e31260ce 100644
--- a/src/math/test/CMakeLists.txt
+++ b/src/math/test/CMakeLists.txt
@@ -3,7 +3,6 @@ cmake_minimum_required(VERSION 2.8)
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE debug)
 endif(NOT CMAKE_BUILD_TYPE)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
 include_directories(
diff --git a/src/sound/oalsound/alsound.cpp b/src/sound/oalsound/alsound.cpp
index f683a62d..b8dbcda3 100644
--- a/src/sound/oalsound/alsound.cpp
+++ b/src/sound/oalsound/alsound.cpp
@@ -49,9 +49,14 @@ void ALSound::CleanUp()
     if (mEnabled) {
         GetLogger()->Info("Unloading files and closing device...\n");
         StopAll();
+	
+	for (auto channel : mChannels) {
+	    delete channel.second;
+	}
 
-        for (auto item : mSounds)
+        for (auto item : mSounds) {
             delete item.second;
+	}
 
         mEnabled = false;
         alutExit();
@@ -213,7 +218,7 @@ bool ALSound::SearchFreeBuffer(Sound sound, int &channel, bool &bAlreadyLoaded)
 
         it.second->SetPriority(priority);
         channel = it.first;
-        bAlreadyLoaded = true;
+        bAlreadyLoaded = it.second->IsLoaded();
         return true;
     }
 
@@ -296,15 +301,20 @@ int ALSound::Play(Sound sound, Math::Vector pos, float amplitude, float frequenc
         GetLogger()->Warn("Sound %d was not loaded!\n", sound);
         return -1;
     }
-    
+       
     GetLogger()->Trace("ALSound::Play sound: %d volume: %f frequency: %f\n", sound, amplitude, frequency);
 
     int channel;
     bool bAlreadyLoaded;
     if (!SearchFreeBuffer(sound, channel, bAlreadyLoaded))
         return -1;
-    if ( !bAlreadyLoaded ) {
-        mChannels[channel]->SetBuffer(mSounds[sound]);
+    
+    bAlreadyLoaded = false;
+    if (!bAlreadyLoaded) {
+        if (!mChannels[channel]->SetBuffer(mSounds[sound])) {
+	    GetLogger()->Trace("ALSound::Play SetBuffer failed\n");
+	    return -1;
+	}
     }
 
     Position(channel, pos);
diff --git a/src/sound/oalsound/channel.cpp b/src/sound/oalsound/channel.cpp
index 7d8244b9..e1bf2028 100644
--- a/src/sound/oalsound/channel.cpp
+++ b/src/sound/oalsound/channel.cpp
@@ -36,6 +36,7 @@ Channel::Channel() {
 
 Channel::~Channel() {
     if (mReady) {
+	alSourceStop(mSource);
         alSourcei(mSource, AL_BUFFER, 0);
         alDeleteSources(1, &mSource);
         if (alCheck())
@@ -45,7 +46,7 @@ Channel::~Channel() {
 
 
 bool Channel::Play() {
-    if (!mReady)
+    if (!mReady || mBuffer == nullptr)
         return false;
     
     alSourcePlay(mSource);
@@ -56,7 +57,7 @@ bool Channel::Play() {
 
 
 bool Channel::SetPosition(Math::Vector pos) {
-    if (!mReady)
+    if (!mReady || mBuffer == nullptr)
         return false;
     
     alSource3f(mSource, AL_POSITION, pos.x, pos.y, pos.z);
@@ -70,7 +71,7 @@ bool Channel::SetPosition(Math::Vector pos) {
 
 bool Channel::SetFrequency(float freq)
 {
-    if (!mReady)
+    if (!mReady || mBuffer == nullptr)
         return false;
 
     alSourcef(mSource, AL_PITCH, freq);
@@ -85,7 +86,7 @@ bool Channel::SetFrequency(float freq)
 float Channel::GetFrequency()
 {
     ALfloat freq;
-    if (!mReady)
+    if (!mReady || mBuffer == nullptr)
         return 0;
     
     alGetSourcef(mSource, AL_PITCH, &freq);
@@ -100,7 +101,7 @@ float Channel::GetFrequency()
 
 bool Channel::SetVolume(float vol)
 {
-    if (!mReady || vol < 0)
+    if (!mReady || vol < 0 || mBuffer == nullptr)
         return false;
     
     alSourcef(mSource, AL_GAIN, vol / MAXVOLUME);
@@ -115,7 +116,7 @@ bool Channel::SetVolume(float vol)
 float Channel::GetVolume()
 {
     ALfloat vol;
-    if (!mReady)
+    if (!mReady || mBuffer == nullptr)
         return 0;
     
     alGetSourcef(mSource, AL_GAIN, &vol);
@@ -201,6 +202,9 @@ void Channel::ResetOper()
 
 
 Sound Channel::GetSoundType() {
+    if (!mReady || mBuffer == nullptr)
+        return SOUND_NONE;
+    
     return mBuffer->GetSoundType();
 }
 
@@ -233,7 +237,8 @@ void Channel::AdjustVolume(float volume) {
 
 bool Channel::IsPlaying() {
     ALint status;
-    if (!mReady) return false;
+    if (!mReady || mBuffer == nullptr)
+	return false;
     
     alGetSourcei(mSource, AL_SOURCE_STATE, &status);
     if (alCheck()) {
@@ -249,8 +254,15 @@ bool Channel::IsReady() {
     return mReady;
 }
 
+bool Channel::IsLoaded() {
+    return mBuffer == nullptr;
+}
+
 
 bool Channel::Stop() {
+    if (!mReady || mBuffer == nullptr)
+	return false;
+    
     alSourceStop(mSource);
     if (alCheck()) {
         GetLogger()->Warn("Could not stop sound. Code: %d\n", alGetCode());
@@ -262,6 +274,9 @@ bool Channel::Stop() {
 
 float Channel::GetCurrentTime()
 {
+    if (!mReady || mBuffer == nullptr)
+	return 0.0f;
+    
     ALfloat current;
     alGetSourcef(mSource, AL_SEC_OFFSET, &current);
     if (alCheck()) {
@@ -274,6 +289,9 @@ float Channel::GetCurrentTime()
 
 void Channel::SetCurrentTime(float current)
 {
+    if (!mReady || mBuffer == nullptr)
+	return;
+    
     alSourcef(mSource, AL_SEC_OFFSET, current);
     if (alCheck())
         GetLogger()->Warn("Could not get source current play time. Code: %d\n", alGetCode());
@@ -282,6 +300,9 @@ void Channel::SetCurrentTime(float current)
 
 float Channel::GetDuration()
 {
+    if (!mReady || mBuffer == nullptr)
+	return 0.0f;
+    
     return mBuffer->GetDuration();
 }
 
diff --git a/src/sound/oalsound/channel.h b/src/sound/oalsound/channel.h
index 165ff503..5caf2b04 100644
--- a/src/sound/oalsound/channel.h
+++ b/src/sound/oalsound/channel.h
@@ -60,6 +60,7 @@ class Channel
         float GetVolume();
         bool IsPlaying();
         bool IsReady();
+	bool IsLoaded();
 
         bool SetBuffer(Buffer *);
         bool HasEnvelope();
diff --git a/src/sound/sound.h b/src/sound/sound.h
index 518e2ada..a09c587a 100644
--- a/src/sound/sound.h
+++ b/src/sound/sound.h
@@ -47,6 +47,7 @@
 **/
 enum Sound
 {
+  SOUND_NONE = -1,  
   SOUND_CLICK = 0,
   SOUND_BOUM  = 1,
   SOUND_EXPLO  = 2,
diff --git a/src/ui/test/CMakeLists.txt b/src/ui/test/CMakeLists.txt
index e411067b..c38d2bb6 100644
--- a/src/ui/test/CMakeLists.txt
+++ b/src/ui/test/CMakeLists.txt
@@ -3,7 +3,6 @@ cmake_minimum_required(VERSION 2.8)
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE debug)
 endif(NOT CMAKE_BUILD_TYPE)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast -std=gnu++0x")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 
 include_directories(