diff --git a/apps/OpenSpace/main.cpp b/apps/OpenSpace/main.cpp
index 75e9e892cb..1f92ec9431 100644
--- a/apps/OpenSpace/main.cpp
+++ b/apps/OpenSpace/main.cpp
@@ -984,6 +984,32 @@ int main(int argc, char** argv) {
     LINFO(fmt::format("Detected OpenGL version: {}.{}", version.first, version.second));
     bool initSuccess = SgctEngine->init(versionMapping[version]);
 
+#ifdef __APPLE__
+    // Workaround for OpenGL bug that Apple introduced in 10.14 Mojave that prevents an
+    // OpenGL context to display anything until it is first moved or resized in dark
+    // mode. So we are going through all windows here and resize them a bit larger and
+    // then back to the desired resolution. Resizing the window to the same size doesn't
+    // work as GLFW probably has a check for setting the current values.
+    // This can be removed once the OpenGL bug is fixed.
+    // In order to check, comment out the following lines and start OpenSpace on a 10.14
+    // machine. If the loading screen shows up without doing anything to the window, it
+    // is fixed. With the bug, the rendering stays gray even well after the main render
+    // loop has started     -- 2018-10-28   abock
+    size_t n = sgct::Engine::instance()->getNumberOfWindows();
+    for (size_t i = 0; i < n; ++i) {
+        GLFWwindow* w = sgct::Engine::instance()->getWindowPtr(i)->getWindowHandle();
+        int x, y;
+        glfwGetWindowPos(w, &x, &y);
+        glfwSetWindowPos(w, x + 1, y + 1);
+        glfwSwapBuffers(w);
+        glfwPollEvents();
+        glfwSetWindowPos(w, x, y);
+        glfwSwapBuffers(w);
+        glfwPollEvents();
+    }
+#endif // __APPLE__
+
+
     // Do not print message if slaves are waiting for the master
     // Only timeout after 15 minutes
     SgctEngine->setSyncParameters(false, 15.f * 60.f);
diff --git a/ext/ghoul b/ext/ghoul
index 72d2faba17..bc49533f5f 160000
--- a/ext/ghoul
+++ b/ext/ghoul
@@ -1 +1 @@
-Subproject commit 72d2faba17787c832d75cd4de40efd6b0cbb76e8
+Subproject commit bc49533f5fa97b23c7cde4cc45603f3671404d85
diff --git a/src/scene/scene_lua.inl b/src/scene/scene_lua.inl
index 6673f72140..964bd0989d 100644
--- a/src/scene/scene_lua.inl
+++ b/src/scene/scene_lua.inl
@@ -522,7 +522,6 @@ int hasSceneGraphNode(lua_State* L) {
     return 1;
 }
 
-#pragma optimize("", off)
 int addInterestingTime(lua_State* L) {
     ghoul::lua::checkArgumentsAndThrow(L, 2, "lua::addInterestingTime");