diff --git a/labscript_utils/excepthook/__init__.py b/labscript_utils/excepthook/__init__.py
index 9ac5975d..c6551fc8 100644
--- a/labscript_utils/excepthook/__init__.py
+++ b/labscript_utils/excepthook/__init__.py
@@ -28,6 +28,7 @@ class l:
     logger = None
 
 child_processes = []
+_original_showwarning = warnings.showwarning
 
 
 def install_thread_excepthook():
@@ -83,12 +84,11 @@ def tkhandler(exceptclass, exception, exec_info, reraise=True):
 def logwarning(message, category, filename, lineno, file=None, line=None):
     logmessage = warnings.formatwarning(message, category, filename, lineno, line)
     l.logger.warn(logmessage)
-    warnings._showwarning(message, category, filename, lineno, file, line)
+    _original_showwarning(message, category, filename, lineno, file, line)
 
 
 def set_logger(logger):
     l.logger = logger
-    warnings._showwarning = warnings.showwarning
     warnings.showwarning = logwarning
 
 # Check for tkinter availability. Tkinter is frustratingly not available
diff --git a/labscript_utils/ls_zprocess.py b/labscript_utils/ls_zprocess.py
index 4d9e9575..6fd47459 100644
--- a/labscript_utils/ls_zprocess.py
+++ b/labscript_utils/ls_zprocess.py
@@ -106,8 +106,8 @@ def get_config():
         config['allow_insecure'] = labconfig.getboolean('security', 'allow_insecure')
     except (labconfig.NoOptionError, labconfig.NoSectionError):
         config['allow_insecure'] = False
-        if config['shared_secret'] is None and not config['allow_insecure']:
-            raise ValueError(_ERR_NO_SHARED_SECRET.replace('/', os.sep))
+    if config['shared_secret'] is None and not config['allow_insecure']:
+        raise ValueError(_ERR_NO_SHARED_SECRET.replace('/', os.sep))
     try:
         config['logging_maxBytes'] = labconfig.getint('logging', 'maxBytes')
     except (labconfig.NoOptionError, labconfig.NoSectionError):
@@ -257,7 +257,7 @@ def socket(self, socket_type, socket_class=None, **kwargs):
         # be a SecureSocket. If caller has explicitly requested a different socket type
         # (e.g since pyzmq 25, ThreadAuthenticator sets up an internal socket by calling
         # `Context.socket(..., socket_class=zmq.Socket)), then don't.`
-        if socket_class is None or issubclass(socket_class, SecureContext):
+        if socket_class is None or issubclass(socket_class, SecureSocket):
             config = get_config()
             kwargs['allow_insecure'] = config['allow_insecure']
         return SecureContext.socket(self, socket_type=socket_type, **kwargs)
diff --git a/labscript_utils/properties.py b/labscript_utils/properties.py
index 092df528..5f8488ed 100644
--- a/labscript_utils/properties.py
+++ b/labscript_utils/properties.py
@@ -61,6 +61,10 @@ def _default(o):
     # Workaround for https://bugs.python.org/issue24313
     if isinstance(o, np.integer):
         return int(o)
+    if isinstance(o, np.floating):
+        return float(o)
+    if isinstance(o, np.bool_):
+        return bool(o)
     raise TypeError
 
 
diff --git a/labscript_utils/zlock.py b/labscript_utils/zlock.py
index 5878997f..baac341b 100644
--- a/labscript_utils/zlock.py
+++ b/labscript_utils/zlock.py
@@ -40,7 +40,7 @@ def main():
         '-m',
         'zprocess.zlock',
         '--port',
-        config['zlock_port'],
+        str(config['zlock_port']),
         '-l',
         LOG_PATH,
     ]