diff --git a/examples/scenes/src/mmark.rs b/examples/scenes/src/mmark.rs
index 3deea8d..ac4924a 100644
--- a/examples/scenes/src/mmark.rs
+++ b/examples/scenes/src/mmark.rs
@@ -105,7 +105,7 @@
                 element.is_split ^= true;
             }
         }
-        let label = format!("mmark test: {} path elements (up/down to adjust)", n);
+        let label = format!("mmark test: complexity: {}, {} path elements (up/down to adjust)", c, n);
         params.text.add(
             scene,
             None,
diff --git a/examples/with_winit/src/lib.rs b/examples/with_winit/src/lib.rs
index 8346274..fa23ee2 100644
--- a/examples/with_winit/src/lib.rs
+++ b/examples/with_winit/src/lib.rs
@@ -181,6 +181,7 @@
     }
     let mut prev_scene_ix = scene_ix - 1;
     let mut modifiers = ModifiersState::default();
+	let mut debug_dump_time = Instant::now();
     event_loop
         .run(move |event, event_loop| match event {
             Event::WindowEvent {
@@ -525,6 +526,23 @@
                             frame_time_us: (new_time - frame_start_time).as_micros() as u64,
                         });
                         frame_start_time = new_time;
+
+                        if (new_time - debug_dump_time).as_secs() > 2 && scene_complexity.is_some() {
+                            scene.print_path_counts();
+                            //let bump_estimate = scene.bump_estimate(None);
+                            let bump_actual = scene_complexity.as_ref().unwrap();
+                            //println!("Last frame estimated bump buffer counts:{bump_estimate}\n");
+                            println!(
+                                "Last frame actual bump buffer counts:{}\n \
+                                    \tBlend:\t\t\t{}\n\
+                                    \tError Bits:\t\t0x{:#08x}\n\
+                                    --------\n",
+                                    bump_actual.memory(),
+                                    bump_actual.blend,
+                                    bump_actual.failed
+                            );
+                            debug_dump_time = new_time;
+                        }
                     }
                     _ => {}
                 }
diff --git a/shader/flatten.wgsl b/shader/flatten.wgsl
index 6b20026..dede2f2 100644
--- a/shader/flatten.wgsl
+++ b/shader/flatten.wgsl
@@ -421,7 +421,7 @@
             let normalized_offset = offset / cubic_params.chord_len;
             let dist_scaled = normalized_offset * es.params.ch;
 // NOTE: set this to "ifndef" to lower to arcs before flattening. Use ifdef to lower directly to lines.
-#ifdef arcs
+#ifndef arcs
             let arclen = length(es.p0 - es.p1) / es.params.ch;
             let est_err = (1. / 120.) / tol * abs(k1) * (arclen + 0.4 * abs(k1 * offset));
             let n_subdiv = cbrt(est_err);
@@ -546,7 +546,7 @@
     path_ix: u32, begin: vec2f, end: vec2f, center: vec2f, angle: f32, transform: Transform
 ) {
 // NOTE: change this to "ifndef" to just render the arc chords.
-#ifdef ablate_arc_flattening
+#ifndef ablate_arc_flattening
     output_line_with_transform(path_ix, begin, end, transform);
 #else
     var p0 = transform_apply(transform, begin);
diff --git a/src/lib.rs b/src/lib.rs
index 194b9a0..dcdc731 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -434,7 +434,7 @@
         let mut render = Render::new();
         let encoding = scene.encoding();
         // TODO: turn this on; the download feature interacts with CPU dispatch
-        let robust = false;
+        let robust = true;
         let recording = render.render_encoding_coarse(encoding, &self.shaders, params, robust);
         let target = render.out_image();
         let bump_buf = render.bump_buf();
diff --git a/src/scene.rs b/src/scene.rs
index c93d68a..c272d3c 100644
--- a/src/scene.rs
+++ b/src/scene.rs
@@ -29,6 +29,10 @@
         Self::default()
     }
 
+    pub fn print_path_counts(&self) {
+        println!("scene n_paths: {}, n_path_segments: {}", self.encoding.n_paths, self.encoding.n_path_segments);
+    }
+
     /// Removes all content from the scene.
     pub fn reset(&mut self) {
         self.encoding.reset();