+++ src/app/virtualbox/src/VBox/Frontends/VBoxBFE/VBoxBFE.cpp	2014-05-14
@@ -1132,7 +1135,9 @@
             parms[1].u.pointer.size = sizeof (SHFLSTRING) + cbString;
 
             parms[2].type = VBOX_HGCM_SVC_PARM_32BIT;
-            parms[2].u.uint32 = !g_fShareReadOnly[i];
+            parms[2].u.uint32 = g_fShareReadOnly[i] ? 0 : SHFL_ADD_MAPPING_F_WRITABLE;
+
+            parms[2].u.uint32 |= SHFL_ADD_MAPPING_F_AUTOMOUNT;
 
             rc2 = gVMMDev->hgcmHostCall ("VBoxSharedFolders",
                                          SHFL_FN_ADD_MAPPING, SHFL_CPARMS_ADD_MAPPING, &parms[0]);