diff --git a/api/graphics2_unix.C b/api/graphics2_unix.C
index 29cfcd5c09..e71387f9dd 100644
--- a/api/graphics2_unix.C
+++ b/api/graphics2_unix.C
@@ -22,6 +22,8 @@ static int clicked_button;
 static int win=0;
 
 #ifdef __APPLE__
+#include <sys/param.h>  // for MAXPATHLEN
+
 static bool need_show = false;
 #endif
 
@@ -138,6 +140,10 @@ static void timer_handler(int) {
 }
 
 void boinc_graphics_loop(int argc, char** argv) {
+#ifdef __APPLE__
+    char dir [MAXPATHLEN];
+    getcwd(dir, MAXPATHLEN);
+#endif
     for (int i=1; i<argc; i++) {
         if (!strcmp(argv[i], "--fullscreen")) {
             fullscreen = true;
@@ -146,5 +152,9 @@ void boinc_graphics_loop(int argc, char** argv) {
     boinc_glut_init();
     make_window();
     glutTimerFunc(TIMER_INTERVAL_MSEC, timer_handler, 0);      
+#ifdef __APPLE__
+    // Apparently glut changed our working directory in OS 10.3.9
+    chdir(dir);
+#endif
     glutMainLoop();
 }
diff --git a/api/graphics2_util.C b/api/graphics2_util.C
index c44a7d87cc..c9504197aa 100644
--- a/api/graphics2_util.C
+++ b/api/graphics2_util.C
@@ -42,6 +42,9 @@ void* boinc_graphics_make_shmem(char* prog_name, int size) {
     char shmem_name[256];
     get_shmem_name(prog_name, shmem_name);
     int retval = create_shmem(shmem_name, size, &p);
+    // Graphics app may be run by a different user & group than worker app
+    // Although create_shmem passed 0666 to open(), it was modified by umask
+    if (retval == 0) chmod(shmem_name, 0666);
 #else
     key_t key = get_shmem_name(prog_name);
     int retval = create_shmem(key, size, 0, &p);
@@ -64,17 +67,14 @@ void* boinc_graphics_get_shmem(char* prog_name) {
 #else
 void* boinc_graphics_get_shmem(char* prog_name) {
     void* p;
+    int retval;
 #ifdef USE_FILE_MAPPED_SHMEM
-    struct stat sbuf;
     char shmem_name[256];
     get_shmem_name(prog_name, shmem_name);
-    int retval = stat(shmem_name, &sbuf);
-    if (retval == 0) {
-        retval = create_shmem(shmem_name, sbuf.st_size, &p);
-    }
+    retval = attach_shmem(shmem_name, &p);
 #else
     key_t key = get_shmem_name(prog_name);
-    int retval = attach_shmem(key, &p);
+    retval = attach_shmem(key, &p);
 #endif
     if (retval) return 0;
     return p;