diff --git a/app_state.py b/app_state.py
index 08d795f..a68bd27 100644
--- a/app_state.py
+++ b/app_state.py
@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.076"
+VERSION = "0.0.0.077"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True
diff --git a/dasp.py b/dasp.py
index 75db4af..f2b0100 100644
--- a/dasp.py
+++ b/dasp.py
@@ -615,7 +615,7 @@ class DaspSession:
         self.num_received = 0
         self.num_retries = 0
         self._nonce = None
-        self._close_lock = threading.Lock()
+        self._close_lock = threading.RLock()
         self.on_close = None  # callback
 
     # ── Client handshake ────────────────────────────────────────
diff --git a/main.py b/main.py
index ecb3587..5db8dfe 100644
--- a/main.py
+++ b/main.py
@@ -1961,7 +1961,7 @@ def _load_live_schema(ds):
     app_state.final_components_registry.clear()
     if ds.sox_client and ds.sox_client.schema_parts:
         for part in ds.sox_client.schema_parts:
-            app_state.active_schema_kits[part.name] = f"{part.checksum:08x}"
+            app_state.active_schema_kits[part.name] = f"{part.checksum & 0xFFFFFFFF:08x}"
         try:
             schema.load_schema_kits_and_manifests()
         except Exception:
diff --git a/sox.py b/sox.py
index 2fae903..59db974 100644
--- a/sox.py
+++ b/sox.py
@@ -311,7 +311,7 @@ class KitPart:
         self.checksum = checksum
 
     def __repr__(self):
-        return f"{self.name}-{self.checksum:08x}"
+        return f"{self.name}-{self.checksum & 0xFFFFFFFF:08x}"
 
 
 class VersionInfo: