diff --git a/ipsae.py b/ipsae.py
index 45f64de..9669c0b 100644
--- a/ipsae.py
+++ b/ipsae.py
@@ -431,49 +431,86 @@ def classify_chains(chains, residue_types):
         sys.exit()
         
 if boltz1:
-    # Boltz1 filenames:
-    # AURKA_TPX2_model_0.cif
-    # confidence_AURKA_TPX2_model_0.json
-    # pae_AURKA_TPX2_model_0.npz
-    # plddt_AURKA_TPX2_model_0.npz
-    
+    # Boltz1 / Boltz-2 filenames:
+    #   <stem>.cif
+    #   confidence_<stem>.json
+    #   pae_<stem>.npz
+    #   plddt_<stem>.npz
+
+    plddt_file_path = pae_file_path.replace("pae", "plddt")
+    numres = len(residues)  # number of residues we parsed from the structure
 
-    plddt_file_path=pae_file_path.replace("pae","plddt")
+    # --- plDDT handling ---
     if os.path.exists(plddt_file_path):
-        data_plddt=np.load(plddt_file_path)
-        plddt_boltz1=np.array(100.0*data_plddt['plddt'])
-        plddt =    plddt_boltz1[np.ix_(token_array.astype(bool))]
-        cb_plddt = plddt_boltz1[np.ix_(token_array.astype(bool))]
+        data_plddt = np.load(plddt_file_path)
+        # Boltz plDDT is 0–1; convert to 0–100 like AF
+        plddt_boltz1 = np.array(100.0 * data_plddt["plddt"])
+        M = len(plddt_boltz1)
+        n_common = min(M, numres)
+
+        # Always make per-residue arrays of length numres
+        plddt = np.zeros(numres, dtype=float)
+        cb_plddt = np.zeros(numres, dtype=float)
+        plddt[:n_common] = plddt_boltz1[:n_common]
+        cb_plddt[:n_common] = plddt_boltz1[:n_common]
+
+        if M != numres:
+            print(
+                f"WARNING (Boltz1): plDDT length ({M}) != number of residues ({numres}); "
+                f"using first {n_common} positions and zero-padding the rest."
+            )
     else:
-        plddt = np.zeros(ntokens)
-        cb_plddt = np.zeros(ntokens)
-        
+        print("Boltz1 pLDDT file does not exist: ", plddt_file_path)
+        # fall back to zeros
+        plddt = np.zeros(numres, dtype=float)
+        cb_plddt = np.zeros(numres, dtype=float)
+
+    # --- PAE handling ---
     if os.path.exists(pae_file_path):
         data_pae = np.load(pae_file_path)
-        pae_matrix_boltz1=np.array(data_pae['pae'])
-        pae_matrix = pae_matrix_boltz1[np.ix_(token_array.astype(bool), token_array.astype(bool))]
-
+        pae_matrix_boltz1 = np.array(data_pae["pae"])
+        M_pae = pae_matrix_boltz1.shape[0]
+        if pae_matrix_boltz1.shape[0] != pae_matrix_boltz1.shape[1]:
+            print("ERROR: Boltz1 PAE matrix is not square; quitting.")
+            sys.exit(1)
+
+        n_common_pae = min(M_pae, numres)
+
+        # Big default PAE so out-of-range residues are effectively ignored
+        pae_matrix = np.full((numres, numres), 99.0, dtype=float)
+        pae_matrix[:n_common_pae, :n_common_pae] = pae_matrix_boltz1[:n_common_pae, :n_common_pae]
+
+        if M_pae != numres:
+            print(
+                f"WARNING (Boltz1): PAE matrix size ({M_pae}) != number of residues ({numres}); "
+                f"using top-left {n_common_pae}×{n_common_pae} block and filling the rest with 99 Å."
+            )
     else:
         print("Boltz1 PAE file does not exist: ", pae_file_path)
-        sys.exit()
-    
-    summary_file_path=pae_file_path.replace("pae","confidence")
-    summary_file_path=summary_file_path.replace(".npz",".json")
-    iptm_boltz1=   {chain1: {chain2: 0     for chain2 in unique_chains if chain1 != chain2} for chain1 in unique_chains}
+        sys.exit(1)
+
+    # --- ipTM per chain pair from Boltz confidence json ---
+    summary_file_path = pae_file_path.replace("pae", "confidence").replace(".npz", ".json")
+    iptm_boltz1 = {chain1: {chain2: 0.0 for chain2 in unique_chains if chain1 != chain2}
+                   for chain1 in unique_chains}
+
     if os.path.exists(summary_file_path):
-        with open(summary_file_path, 'r') as file:
+        with open(summary_file_path, "r") as file:
             data_summary = json.load(file)
 
-            boltz1_chain_pair_iptm_data=data_summary['pair_chains_iptm']
-            for chain1 in unique_chains:
-                nchain1=  ord(chain1) - ord('A')  # map A,B,C... to 0,1,2...
-                for chain2 in unique_chains:
-                    if chain1 == chain2: continue
-                    nchain2=ord(chain2) - ord('A')
-                    iptm_boltz1[chain1][chain2]=boltz1_chain_pair_iptm_data[str(nchain1)][str(nchain2)]
+        boltz1_chain_pair_iptm_data = data_summary["pair_chains_iptm"]
+        for chain1 in unique_chains:
+            nchain1 = ord(chain1) - ord("A")  # map A,B,C... to 0,1,2...
+            for chain2 in unique_chains:
+                if chain1 == chain2:
+                    continue
+                nchain2 = ord(chain2) - ord("A")
+                iptm_boltz1[chain1][chain2] = boltz1_chain_pair_iptm_data[str(nchain1)][str(nchain2)]
     else:
         print("Boltz1 summary file does not exist: ", summary_file_path)
 
+
+
 if af3:
     # Example Alphafold3 server filenames
     #   fold_aurka_0_tpx2_0_full_data_0.json
@@ -967,4 +1004,4 @@ def classify_chains(chains, residue_types):
         chain1_residues = f'chain  {chain1} and resi {contiguous_ranges(unique_residues_chain1[chain1][chain2])}'
         chain2_residues = f'chain  {chain2} and resi {contiguous_ranges(unique_residues_chain2[chain1][chain2])}'
         PML.write(f'alias {chain_pair}, color gray80, all; color {color1}, {chain1_residues}; color {color2}, {chain2_residues}\n\n')
-    OUT.write("\n")
+    OUT.write("\n")
\ No newline at end of file