diff --git a/emscripten/Makefile b/emscripten/Makefile
index 5bdd7e766..86a94be06 100644
--- a/emscripten/Makefile
+++ b/emscripten/Makefile
@@ -1,5 +1,5 @@
 all:
-	emcc -pthread -I../src/ ../src/*.c -DOPENGL=1 -s EXPORTED_RUNTIME_METHODS='["cwrap","getValue"]' -sSTACK_SIZE=655360 -s USE_GLFW=3 -s FULL_ES3=1 -Wl,--whole-archive -s LINKABLE=1 -o rebound.html
+	emcc -pthread -I../src/ ../src/*.c -DOPENGL=1 -s EXPORTED_RUNTIME_METHODS='["cwrap","getValue"]' -sSTACK_SIZE=655360 -s USE_GLFW=3 -s FULL_ES3=1 -Wl,--whole-archive -s LINKABLE=1 -sPTHREAD_POOL_SIZE=2 -o rebound.html
 
 serve:
 	python serve.py
diff --git a/src/display.c b/src/display.c
index d5c8e64a1..ddbcfa046 100644
--- a/src/display.c
+++ b/src/display.c
@@ -176,7 +176,7 @@ static unsigned int linkProgram(int prog){
     
     GLint logLength;
     glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &logLength);
-    if (logLength > 0) {
+    if (logLength > 1) { // 0 should work - bug in emscripten?
         GLchar *log = (GLchar *)malloc(logLength);
         glGetProgramInfoLog(prog, logLength, &logLength, log);
         printf("\n\n%s\n\n",log);
@@ -298,7 +298,6 @@ static void reb_display_cursor(GLFWwindow* window, double x, double y){
 }
 
 static void reb_display_keyboard(GLFWwindow* window, int key, int scancode, int action, int mods){
-    printf("keypress!\n");
     struct reb_display_data* data = glfwGetWindowUserPointer(window);
     data->key_mods = mods;
     if (action==GLFW_PRESS){
diff --git a/src/rebound.c b/src/rebound.c
index 09be632f8..d76746bf9 100644
--- a/src/rebound.c
+++ b/src/rebound.c
@@ -456,11 +456,8 @@ struct reb_simulation* reb_simulation_create(){
 int main(void){
     struct reb_simulation* r = reb_simulation_create();
 
-    printf("Simulation init done\n");
     reb_simulation_add_plummer(r, 100, 1.0, 1.0); 
-    printf("Simulation plummer done\n");
     reb_simulation_integrate(r,100);
-    printf("Simulation integrate done\n");
     return 0;
 }
 #endif
@@ -890,16 +887,16 @@ enum REB_STATUS reb_simulation_integrate(struct reb_simulation* const r, double
                 reb_display_init_data(r);
                 r->display_data->opengl_enabled = 1;
 
-                //pthread_t compute_thread;
-                //if (pthread_create(&compute_thread,NULL,reb_simulation_integrate_raw,&thread_info)){
-                //    reb_simulation_error(r, "Error creating display thread.");
-                //}
+                pthread_t compute_thread;
+                if (pthread_create(&compute_thread,NULL,reb_simulation_integrate_raw,&thread_info)){
+                    reb_simulation_error(r, "Error creating display thread.");
+                }
                 
                 reb_display_init(r); // Display routines running on main thread.
 
-                //if (pthread_join(compute_thread,NULL)){
-                //    reb_simulation_error(r, "Error joining display thread.");
-               // }
+                if (pthread_join(compute_thread,NULL)){
+                    reb_simulation_error(r, "Error joining display thread.");
+                }
 #else // OPENGL
                 reb_simulation_error(r,"REBOUND was not compiled/linked with OPENGL libraries.");
                 return REB_EXIT_ERROR;