diff --git a/.github/workflows/build_server.yml b/.github/workflows/build_server.yml
index 76933abe..81b6488f 100644
--- a/.github/workflows/build_server.yml
+++ b/.github/workflows/build_server.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-latest, windows-latest]
+        os: [ubuntu-20.04, windows-latest] # removed macos-latest as it's broken for now
         include:
           - os: ubuntu-20.04
             zip_name: freedata-server_ubuntu
diff --git a/tests/test_data_frame_factory.py b/tests/test_data_frame_factory.py
index e0ac0d02..f4f028f8 100755
--- a/tests/test_data_frame_factory.py
+++ b/tests/test_data_frame_factory.py
@@ -32,7 +32,7 @@ class TestDataFrameFactory(unittest.TestCase):
     def testARQConnect(self):
         dxcall = "DJ2LS-4"
         session_id = 123
-        frame = self.factory.build_arq_session_open(dxcall, session_id, 1700)
+        frame = self.factory.build_arq_session_open(dxcall, session_id, 1700, 1)
         frame_data = self.factory.deconstruct(frame)
 
         self.assertEqual(frame_data['origin'], self.factory.myfullcall)
diff --git a/tests/test_message_protocol.py b/tests/test_message_protocol.py
index 26a8a9ff..2e3ccf97 100644
--- a/tests/test_message_protocol.py
+++ b/tests/test_message_protocol.py
@@ -96,12 +96,17 @@ class TestMessageProtocol(unittest.TestCase):
             # Transfer data between both parties
             try:
                 transmission = modem_transmit_queue.get(timeout=1)
+                transmission["bytes"] += bytes(2)  # simulate 2 bytes crc checksum
                 if random.randint(0, 100) < self.loss_probability:
                     self.logger.info(f"[{threading.current_thread().name}] Frame lost...")
                     continue
 
                 frame_bytes = transmission['bytes']
-                frame_dispatcher.new_process_data(frame_bytes, None, len(frame_bytes), 0, 0)
+                if len(frame_bytes) == 5:
+                    mode_name = "SIGNALLING_ACK"
+                else:
+                    mode_name = None
+                frame_dispatcher.process_data(frame_bytes, None, len(frame_bytes), 0, 0, mode_name=mode_name)
             except queue.Empty:
                 continue
         self.logger.info(f"[{threading.current_thread().name}] Channel closed.")
diff --git a/tests/test_protocols.py b/tests/test_protocols.py
index 1dc2d2c9..282319c4 100755
--- a/tests/test_protocols.py
+++ b/tests/test_protocols.py
@@ -41,7 +41,7 @@ class TestProtocols(unittest.TestCase):
                                           cls.modem)
 
     def shortcutTransmission(self, frame_bytes):
-        self.frame_dispatcher.new_process_data(frame_bytes, None, len(frame_bytes), 0, 0)
+        self.frame_dispatcher.process_data(frame_bytes, None, len(frame_bytes), 0, 0, mode_name="TEST")
 
     def assertEventReceivedType(self, event_type):
         ev = self.event_queue.get()