diff --git a/dsv4/layers/shared_expert.py b/dsv4/layers/shared_expert.py
index 72ca19ba..af3951fa 100644
--- a/dsv4/layers/shared_expert.py
+++ b/dsv4/layers/shared_expert.py
@@ -433,6 +433,7 @@ class Nvfp4SharedExpert:
             intermediate = self._run_l1_fused(hidden_states)
         else:
             l1_out = self._run_l1(hidden_states)
+            print(f"  SE L1 out: shape={tuple(l1_out.shape)} |max|={l1_out.abs().max().item() if l1_out.numel() > 0 else 'EMPTY'} nan={torch.isnan(l1_out).any().item() if l1_out.numel() > 0 else 'N/A'}", flush=True)
             if l1_out.shape[1] < 2 * self.intermediate_size:
                 print(f"  WARNING: l1_out shape {l1_out.shape} < expected (N, {2*self.intermediate_size})", flush=True)