diff --git a/core/src/main/java/dev/quoije/umd/rco/anim/Tween.java b/core/src/main/java/dev/quoije/umd/rco/anim/Tween.java
index 0ccba78..d8b08a6 100644
--- a/core/src/main/java/dev/quoije/umd/rco/anim/Tween.java
+++ b/core/src/main/java/dev/quoije/umd/rco/anim/Tween.java
@@ -49,10 +49,7 @@ public final class Tween {
     }
 
     private static float ease(float p, int accelMode) {
-        return switch (accelMode) {
-            case EASE_IN -> p * p;
-            case EASE_OUT -> 1f - (1f - p) * (1f - p);
-            default -> p;
-        };
+        // JPCSP interpolates linearly and ignores accelMode (see AbstractAnimAction).
+        return p;
     }
 }
diff --git a/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java b/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java
index 3a25922..19539da 100644
--- a/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java
+++ b/ui/src/main/java/dev/quoije/umd/ui/PlayerApp.java
@@ -492,6 +492,15 @@ public final class PlayerApp extends Application {
     }
 
     public static void main(String[] args) {
+        // Capture any uncaught exception (video/audio/animator/timer/FX threads) to a file.
+        Thread.setDefaultUncaughtExceptionHandler((thread, throwable) -> {
+            try (java.io.PrintWriter writer = new java.io.PrintWriter(new java.io.FileWriter("/tmp/umd-crash.log", true))) {
+                writer.println("=== Uncaught in thread " + thread.getName() + " ===");
+                throwable.printStackTrace(writer);
+            } catch (Exception ignored) {
+            }
+            throwable.printStackTrace();
+        });
         launch(args);
     }
 }