Commit: 3bfa8d9fd47936ad46e7030af7e4e0d9d4f1c35c
Author: Campbell Barton
Date:   Fri Jul 15 15:29:27 2016 +1000
Branches: master
https://developer.blender.org/rB3bfa8d9fd47936ad46e7030af7e4e0d9d4f1c35c

Fix py-driver in startup.blend crash in background mode

Obscure regression in own commit from b34929786.
While this could be considered correct, it introduces a crash so disable the 
update call.

===================================================================

M       source/blender/windowmanager/intern/wm_files.c

===================================================================

diff --git a/source/blender/windowmanager/intern/wm_files.c 
b/source/blender/windowmanager/intern/wm_files.c
index 729af73..fe257cc 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -482,8 +482,6 @@ static void wm_file_read_post(bContext *C, bool 
is_startup_file)
                BPY_python_reset(C);
                addons_loaded = true;
        }
-#else
-       UNUSED_VARS(is_startup_file);
 #endif  /* WITH_PYTHON */
 
        WM_operatortype_last_properties_clear_all();
@@ -492,8 +490,12 @@ static void wm_file_read_post(bContext *C, bool 
is_startup_file)
        BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_VERSION_UPDATE);
        BLI_callback_exec(CTX_data_main(C), NULL, BLI_CB_EVT_LOAD_POST);
 
-       /* would otherwise be handled by event loop */
-       if (G.background) {
+       /* Would otherwise be handled by event loop.
+        *
+        * Disabled for startup file, since it causes problems when PyDrivers 
are used in the startup file.
+        * While its possible state of startup file may be wrong,
+        * in this case users nearly always load a file to replace the startup 
file. */
+       if (G.background && (is_startup_file == false)) {
                Main *bmain = CTX_data_main(C);
                BKE_scene_update_tagged(bmain->eval_ctx, bmain, 
CTX_data_scene(C));
        }

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