diff --git a/doc/release_notes.md b/doc/release_notes.md
index 518fff4c0b7658228f53bb1f2676fb8852a1eb07..374151dd82ea724706bc773187d2f1e54ca73a15 100644
--- a/doc/release_notes.md
+++ b/doc/release_notes.md
@@ -421,8 +421,9 @@ OpenPose Library - Release Notes
     3. Added Asynchronous mode to Python API.
     4. Added `DOWNLOAD_SERVER` variable to CMake. It specifies the link where the models and 3rd party libraries will be downloaded from.
     5. Installation documentation highly simplified and improved.
-    6. Removed all compiler warnings for Ubuntu 20.04 and removed some for Windows 10.
+    6. Removed all compiler warnings for Ubuntu 20.04 (GCC and Clang) as well as some for Windows 10.
 2. Functions or parameters renamed:
+    1. `USE_MKL` disabled by default in Ubuntu. Reason: Not compatible with non-intel CPUs and Ubuntu 20.
 3. Main bugs fixed:
     1. 90 and 270-degree rotations working again.
     2. C++ tutorial API demos only try to cv::imshow the image if it is not empty (avoding the assert that it would trigger otherwise).
diff --git a/include/openpose/thread/thread.hpp b/include/openpose/thread/thread.hpp
index 64a314be87e0dcd27b909fcfb38deb247936e54c..4a38b0d872f1b6670078c0d2dfa09497417eea3c 100644
--- a/include/openpose/thread/thread.hpp
+++ b/include/openpose/thread/thread.hpp
@@ -120,7 +120,7 @@ namespace op
         {
             stopAndJoin();
             spIsRunning = isRunningSharedPtr;
-            *spIsRunning = {true};
+            *spIsRunning = true;
             threadFunction();
         }
         catch (const std::exception& e)
@@ -136,7 +136,7 @@ namespace op
         {
             opLog("", Priority::Low, __LINE__, __FUNCTION__, __FILE__);
             stopAndJoin();
-            *spIsRunning = {true};
+            *spIsRunning = true;
             mThread = {std::thread{&Thread::threadFunction, this}};
         }
         catch (const std::exception& e)
@@ -209,7 +209,7 @@ namespace op
     {
         try
         {
-            *spIsRunning = {false};
+            *spIsRunning = false;
         }
         catch (const std::exception& e)
         {
diff --git a/src/openpose/3d/poseTriangulation.cpp b/src/openpose/3d/poseTriangulation.cpp
index 0b544dfb8a3a4ea5210b3db5f12f7980486b2442..fe6b9f0b4d800230e63e7e4ab709c89571bfc071 100644
--- a/src/openpose/3d/poseTriangulation.cpp
+++ b/src/openpose/3d/poseTriangulation.cpp
@@ -21,6 +21,7 @@ namespace op
         catch (const std::exception& e)
         {
             error(e.what(), __LINE__, __FUNCTION__, __FILE__);
+            return false;
         }
     }
 
diff --git a/src/openpose/core/matrix.cpp b/src/openpose/core/matrix.cpp
index 3cc25e09ed9ef0369bd4f98c838c90e1a02c4a5c..2c1717641d9da6a8ad54bf103a3c3ca4e80a7599 100644
--- a/src/openpose/core/matrix.cpp
+++ b/src/openpose/core/matrix.cpp
@@ -104,6 +104,7 @@ namespace op
         catch (const std::exception& e)
         {
             error(e.what(), __LINE__, __FUNCTION__, __FILE__);
+            return nullptr;
         }
     }
 
@@ -116,6 +117,7 @@ namespace op
         catch (const std::exception& e)
         {
             error(e.what(), __LINE__, __FUNCTION__, __FILE__);
+            return nullptr;
         }
     }
 
diff --git a/src/openpose/pose/poseExtractorNet.cpp b/src/openpose/pose/poseExtractorNet.cpp
index 2684ccc26d54ffe65436f49f298c431982c44194..9623d0a58a93584374d6e404e51c0c3296cbf948 100644
--- a/src/openpose/pose/poseExtractorNet.cpp
+++ b/src/openpose/pose/poseExtractorNet.cpp
@@ -344,7 +344,7 @@ namespace op
             opLog("Property " + std::to_string((int)property)
                 + " set from " + std::to_string(propertyElement)
                 + " to " + std::to_string(value), Priority::High);
-            propertyElement = {value};
+            propertyElement = value;
         }
         catch (const std::exception& e)
         {