diff --git a/agent_v0/server_v1/api_stream.py b/agent_v0/server_v1/api_stream.py
index c767ff063..76fc36776 100644
--- a/agent_v0/server_v1/api_stream.py
+++ b/agent_v0/server_v1/api_stream.py
@@ -4557,16 +4557,16 @@ def _resolve_by_grounding(
         from PIL import Image as PILImage
         from pathlib import Path
 
-        # Chercher le screenshot fenêtre (_window.png)
-        full_path = Path(screenshot_path)
-        win_path = full_path.parent / full_path.name.replace("_full.png", "_window.png")
+        # Utiliser la fenêtre active : cropper depuis le screenshot full
+        # via window_rect (fonctionne au replay comme à l'enregistrement)
+        img = PILImage.open(screenshot_path)
 
-        if win_path.is_file() and window_rect:
-            img = PILImage.open(str(win_path))
+        if window_rect:
+            x1, y1, x2, y2 = window_rect
+            img = img.crop((x1, y1, x2, y2))
             using_window = True
-            logger.debug("Grounding : image fenêtre %s (%dx%d)", win_path.name, *img.size)
+            logger.debug("Grounding : crop fenêtre (%d,%d,%d,%d) → %dx%d", x1, y1, x2, y2, *img.size)
         else:
-            img = PILImage.open(screenshot_path)
             using_window = False
 
         orig_w, orig_h = img.size