2 files changed, 7 insertions, 1 deletions
diff --git a/blastem.c b/blastem.c
index f1927f2..3d3a30d 100644
--- a/blastem.c
+++ b/blastem.c
@@ -639,6 +639,9 @@ int main(int argc, char ** argv)
 		fullscreen = !fullscreen;
 	}
 	if (!headless) {
+		if (reader_addr) {
+			render_set_external_sync(1);
+		}
 		render_init(width, height, "BlastEm", fullscreen);
 		render_set_drag_drop_handler(on_drag_drop);
 	}
diff --git a/render_sdl.c b/render_sdl.c
index 79e9b37..bdc8117 100755
--- a/render_sdl.c
+++ b/render_sdl.c
@@ -265,7 +265,10 @@ void render_set_external_sync(uint8_t ext_sync_on)
 {
 	if (ext_sync_on != external_sync) {
 		external_sync = ext_sync_on;
-		render_config_updated();
+		if (windowed_width) {
+			//only do this if render_init has already been called
+			render_config_updated();
+		}
 	}
 }