diff --git a/appveyor.yml b/appveyor.yml
index 9173ceba..adf9f716 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -115,8 +115,7 @@ configuration:
   # - Release
 
 cache:
-  - C:/vcpkg/installed/ -> appveyor.yml
-  - C:/vcpkg/scripts/ -> appveyor.yml
+  - C:/vcpkg/ -> appveyor.yml
 
 build:
   parallel: true                                    # enable MSBuild parallel builds
@@ -140,6 +139,6 @@ build_script:
   - cd %APPVEYOR_BUILD_FOLDER%
   - mkdir build
   - cd build
-  - cmake %APPVEYOR_BUILD_FOLDER% -G "%generator%" -DCMAKE_INSTALL_PREFIX=%APPVEYOR_BUILD_FOLDER%/build/package -DBOOST_ROOT="%BOOST_ROOT%" -DCMAKE_TOOLCHAIN_FILE=c:/vcpkg/scripts/buildsystems/vcpkg.cmake -DFreeImage_ROOT="c:/vcpkg/installed/x64-windows"
+  - cmake %APPVEYOR_BUILD_FOLDER% -G "%generator%" -DCMAKE_INSTALL_PREFIX=%APPVEYOR_BUILD_FOLDER%/build/package -DBOOST_ROOT="%BOOST_ROOT%" -DCMAKE_TOOLCHAIN_FILE=c:/vcpkg/scripts/buildsystems/vcpkg.cmake -DFreeImage_ROOT="c:/vcpkg/installed/x64-windows" -DCMAKE_BUILD_TYPE:STRING=%configuration%
   - cmake --build . --target ALL_BUILD --config %configuration% -- /nologo
   - cmake --build . --target INSTALL --config %configuration% -- /nologo
diff --git a/src/backend/opengl/CMakeLists.txt b/src/backend/opengl/CMakeLists.txt
index 1bfa44cd..bbe907fb 100755
--- a/src/backend/opengl/CMakeLists.txt
+++ b/src/backend/opengl/CMakeLists.txt
@@ -93,13 +93,17 @@ target_link_libraries(${BackendTarget}
         glbinding::glbinding
         $<$<NOT:$<CONFIG:Release>>:glbinding::glbinding-aux>
         glm
-        Freetype::Freetype
         Boost::boost
         backend_interface
         wtk_interface
         c_api_interface
         cpp_api_interface
     )
+if (FG_ENABLE_HUNTER)
+    target_link_libraries(${BackendTarget} PRIVATE freetype::freetype)
+else ()
+    target_link_libraries(${BackendTarget} PRIVATE Freetype::Freetype)
+endif ()
 
 if(UNIX)
   target_link_libraries(${BackendTarget}
diff --git a/src/backend/opengl/chart_impl.cpp b/src/backend/opengl/chart_impl.cpp
index 5fb163cb..3a84182f 100644
--- a/src/backend/opengl/chart_impl.cpp
+++ b/src/backend/opengl/chart_impl.cpp
@@ -346,7 +346,7 @@ void chart2d_impl::generateChartData()
     pushPoint(decorData,  1.0f, 0.0f);
     pushPoint(decorData,  0.0f,-1.0f);
     pushPoint(decorData,  0.0f, 1.0f);
-    for (int i=1; i<=ticksLeft; ++i) {
+    for (int i=1; i<ticksLeft; ++i) {
         float delta = i*step;
         pushPoint(decorData, -1.0f,-delta);
         pushPoint(decorData,  1.0f,-delta);
@@ -478,7 +478,7 @@ void chart2d_impl::render(const int pWindowId,
     mBorderProgram.bind();
     glUniformMatrix4fv(mBorderUniformMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
     glUniform4fv(mBorderUniformColorIndex, 1, GRAY);
-    glDrawArrays(GL_LINES, 4+2*mTickCount, 4*mTickCount);
+    glDrawArrays(GL_LINES, 4+2*mTickCount, 8*mTickCount-16);
     mBorderProgram.unbind();
     chart2d_impl::unbindResources();
 
@@ -546,7 +546,7 @@ void chart2d_impl::render(const int pWindowId,
 
     if (!mXTitle.empty()) {
         glm::vec4 res = trans * glm::vec4(0.0f, -1.0f, 0.0f, 1.0f);
-//
+
         pos[0] = w*(res.x+1.0f)/2.0f;
         pos[1] = h*(res.y+1.0f)/2.0f;
 
@@ -617,7 +617,12 @@ void chart3d_impl::pushTicktextCoords(const float pX, const float pY, const floa
 void chart3d_impl::generateChartData()
 {
     CheckGL("Begin chart3d_impl::generateChartData");
-    static const float border[] = { -1, -1, 1,  -1, -1, -1,  -1, -1, -1,  1, -1, -1,  1, -1, -1,  1, 1, -1 };
+    static const float border[] = { -1, -1,  1,
+                                    -1, -1, -1,
+                                    -1, -1, -1,
+                                     1, -1, -1,
+                                     1, -1, -1,
+                                     1,  1, -1 };
     static const int nValues = sizeof(border)/sizeof(float);
 
     std::vector<float> decorData;
@@ -711,7 +716,7 @@ void chart3d_impl::generateChartData()
     pushPoint(decorData,  1.0f,  1.0f, 0.0f);
     pushPoint(decorData,  0.0f,  1.0f,-1.0f);
     pushPoint(decorData,  0.0f,  1.0f, 1.0f);
-    for (int i=1; i<=ticksLeft; ++i) {
+    for (int i=1; i<ticksLeft; ++i) {
         float delta = i*step;
         /* xy plane center lines */
         pushPoint(decorData, -1.0f,-delta, -1.0f);
@@ -862,7 +867,7 @@ void chart3d_impl::render(const int pWindowId,
     mBorderProgram.bind();
     glUniformMatrix4fv(mBorderUniformMatIndex, 1, GL_FALSE, glm::value_ptr(trans));
     glUniform4fv(mBorderUniformColorIndex, 1, GRAY);
-    glDrawArrays(GL_LINES, 6+3*mTickCount, 12*mTickCount);
+    glDrawArrays(GL_LINES, 6+3*mTickCount, 3*(8*mTickCount-16));
     mBorderProgram.unbind();
     chart3d_impl::unbindResources();
 
diff --git a/src/backend/opengl/chart_impl.hpp b/src/backend/opengl/chart_impl.hpp
index db929ec9..1e5ee1db 100644
--- a/src/backend/opengl/chart_impl.hpp
+++ b/src/backend/opengl/chart_impl.hpp
@@ -79,7 +79,9 @@ class AbstractChart : public AbstractRenderable {
         }
 
         inline int getNumTicksC2E() const {
-            /* Get # of ticks from center(0,0) to edge along axis */
+            /* Get # of ticks from center(0,0) to edge along axis
+             * Excluding the center tick
+             */
             return (mTickCount-1)/2;
         }
 
diff --git a/src/backend/opengl/common.hpp b/src/backend/opengl/common.hpp
index d3ca0bb2..7ac19b91 100644
--- a/src/backend/opengl/common.hpp
+++ b/src/backend/opengl/common.hpp
@@ -49,7 +49,7 @@ typedef unsigned short  ushort;
 typedef unsigned char   uchar;
 
 static const float BLACK[]   = {0.0f    , 0.0f    , 0.0f    , 1.0f};
-static const float GRAY[]    = {0.85f   , 0.85f   , 0.85f   , 1.0f};
+static const float GRAY[]    = {0.75f   , 0.75f   , 0.75f   , 1.0f};
 static const float WHITE[]   = {1.0f    , 1.0f    , 1.0f    , 1.0f};
 static const float AF_BLUE[] = {0.0588f , 0.1137f , 0.2745f , 1.0f};
 static const glm::mat4 IDENTITY(1.0f);