diff --git a/app-proto/src/add_remove.rs b/app-proto/src/add_remove.rs
index 9db281e..d135449 100644
--- a/app-proto/src/add_remove.rs
+++ b/app-proto/src/add_remove.rs
@@ -187,15 +187,15 @@ pub fn AddRemove() -> View {
                         }
                     );
                     let rep = create_signal(0.0);
+                    let rep_valid = create_signal(false);
                     let active = create_signal(true);
                     state.assembly.insert_constraint(Constraint {
                         args: args,
                         rep: rep,
                         rep_text: create_signal(String::new()),
-                        rep_valid: create_signal(false),
+                        rep_valid: rep_valid,
                         active: active,
                     });
-                    state.assembly.realize();
                     state.selection.update(|sel| sel.clear());
                     
                     /* DEBUG */
@@ -213,15 +213,14 @@ pub fn AddRemove() -> View {
                         }
                     });
                     
-                    // update the realization when the constraint is activated,
-                    // or edited while active
+                    // update the realization when the constraint becomes active
+                    // and valid, or is edited while active and valid
                     create_effect(move || {
+                        console::log_1(&JsValue::from(
+                            format!("Constraint ({}, {}) updated", args.0, args.1)
+                        ));
                         rep.track();
-                        console::log_2(
-                            &JsValue::from("Lorentz product updated to"),
-                            &JsValue::from(rep.get_untracked())
-                        );
-                        if active.get() {
+                        if active.get() && rep_valid.get() {
                             state.assembly.realize();
                         }
                     });