diff --git a/Cargo.lock b/Cargo.lock
index 0f58675e1..d77d98502 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4206,7 +4206,7 @@ dependencies = [
 [[package]]
 name = "opencadcodec"
 version = "0.5.5"
-source = "git+https://github.com/ramox81/cadcodec.git?rev=6d9c604#6d9c604dca78ed2f631e0f5b703415ea1f13b0db"
+source = "git+https://github.com/ramox81/cadcodec.git?rev=48b86d0#48b86d08c895f07b53753888363d1d9a6b282305"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",
diff --git a/Cargo.toml b/Cargo.toml
index 361a526a2..51be8093f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -91,7 +91,7 @@ block2 = "0.5"
 objc2-foundation = { version = "0.2", features = ["NSArray", "NSURL", "NSString", "NSObject", "NSNotification", "NSThread", "NSEnumerator"] }
 
 [patch."https://github.com/HakanSeven12/opencadcodec.git"]
-opencadcodec = { git = "https://github.com/ramox81/cadcodec.git", rev = "6d9c604" }
+opencadcodec = { git = "https://github.com/ramox81/cadcodec.git", rev = "48b86d0" }
 
 [patch.crates-io]
 iced_core = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aad9e00b9327cb7b8546ed84db39" }
diff --git a/src/app/commands/count.rs b/src/app/commands/count.rs
index 754b6db80..101c21c65 100644
--- a/src/app/commands/count.rs
+++ b/src/app/commands/count.rs
@@ -253,7 +253,7 @@ impl OpenCADStudio {
             let r = m.result(&self.tabs[i].scene.document);
             crate::scene::CountDisplay {
                 counted: r.counted.into_iter().collect(),
-                errors: r.errors.into_iter().collect(),
+                errors: r.errors.into_iter().chain(r.overlapped).collect(),
                 color: aci_rgba(self.count_palette.color),
                 error_color: aci_rgba(self.count_palette.error_color),
             }
@@ -287,7 +287,8 @@ impl OpenCADStudio {
             let doc = &self.tabs[i].scene.document;
             if doc.get_entity(h).is_some() && !boundary_in_use(doc, h) {
                 self.push_undo_snapshot(i, "COUNT");
-                self.tabs[i].scene.erase_entities(&[h]);
+                // The area layer is locked; count mode removes its own polyline.
+                self.tabs[i].scene.rollback_new_entities(&[h]);
                 self.tabs[i].dirty = true;
             }
         }
@@ -335,7 +336,7 @@ impl OpenCADStudio {
         }
     }
 
-    /// A closed polyline on `0-CountArea` (colour 152, not plotted,
+    /// A closed polyline on `0-CountArea` (locked, colour 152, not plotted,
     /// Continuous), whatever the current layer.
     fn draw_count_area(&mut self, i: usize, ring: &[[f64; 2]]) -> Option<Handle> {
         self.push_undo_snapshot(i, "COUNT");
@@ -345,6 +346,7 @@ impl OpenCADStudio {
             layer.handle = doc.allocate_handle();
             layer.color = codec::types::Color::from_index(152);
             layer.is_plottable = false;
+            layer.flags.locked = true;
             layer.line_type = "Continuous".into();
             let _ = doc.layers.add(layer);
         }
@@ -400,6 +402,8 @@ impl OpenCADStudio {
             None if targets.is_empty() => None,
             _ => Some(CountTarget::Group(targets.clone())),
         };
+        // The picked targets do not stay selected.
+        self.tabs[i].scene.deselect_all();
         let old = self.tabs[i].count.take();
         if let Some(old) = old.as_ref().filter(|o| o.boundary != boundary) {
             self.drop_count_boundary(i, old.boundary);
diff --git a/src/ui/window/count_palette.rs b/src/ui/window/count_palette.rs
index 877ad92c0..1c33dc886 100644
--- a/src/ui/window/count_palette.rs
+++ b/src/ui/window/count_palette.rs
@@ -58,6 +58,8 @@ pub struct CountMode {
 pub struct CountResult {
     pub counted: Vec<Handle>,
     pub errors: Vec<Handle>,
+    /// The counted references a duplicate overlaps (drawn in the error colour too).
+    pub overlapped: Vec<Handle>,
 }
 
 impl CountMode {
@@ -83,6 +85,7 @@ impl CountMode {
             Some(CountTarget::Group(handles)) => CountResult {
                 counted: handles.iter().copied().filter(|h| doc.get_entity(*h).is_some()).collect(),
                 errors: Vec::new(),
+                overlapped: Vec::new(),
             },
             Some(CountTarget::Block { name, .. }) => {
                 let instances = self.instances(doc);
@@ -91,6 +94,7 @@ impl CountMode {
                 CountResult {
                     counted: instances.iter().filter(mine).filter(|i| i.duplicate_of.is_none()).map(|i| i.handle).collect(),
                     errors: instances.iter().filter(mine).filter(|i| i.duplicate_of.is_some()).map(|i| i.handle).collect(),
+                    overlapped: instances.iter().filter(mine).filter_map(|i| i.duplicate_of).collect(),
                 }
             }
         }