diff --git a/CHANGELOG.md b/CHANGELOG.md
index b9a7d056..999353ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -882,3 +882,9 @@
 
 ## 221204a (5.0.0-post1)
 * Fixed players being unable to play a track via the music list if it is a track of their hub music list but not of their personal music list
+
+## 221208a (5.0.0-post2)
+* Fixed /randommusic failing halfway through
+* Fixed games not asserting properties of player groups after mutator calls
+* Fixed trials being internally initialized incorrectly, which prevented commands such as /nsd_accept and /nsd_reject from running properly
+* Fixed players using clients that do not have a HIDE_CHARACTER argument in inbound IC messages (e.g. AO 2.10) occassionally failing to receive messages if they are in first person mode or not in forward sprites mode
diff --git a/server/client_manager.py b/server/client_manager.py
index 4e2ba54f..7aecdcbd 100644
--- a/server/client_manager.py
+++ b/server/client_manager.py
@@ -324,8 +324,8 @@ def send_ooc_others(
 
         def send_ic(
             self,
-            params: List = None,
-            sender: ClientManager.Client = None,
+            params: Dict[str, Any] = None,
+            sender: Union[ClientManager.Client, None] = None,
             bypass_text_replace: bool = False,
             bypass_deafened_starters: bool = False,
             use_last_received_sprites: bool = False,
@@ -509,7 +509,9 @@ def pop_if_there(dictionary, argument):
                     pargs['pos'] = last_args['pos']
                     pargs['anim_type'] = last_args['anim_type']
                     pargs['flip'] = last_args['flip']
-                    pargs['hide_character'] = last_args['hide_character']
+                    # Only DRO 1.1.0+ has this
+                    if self.packet_handler.HAS_HIDE_CHARACTER_AS_MS_ARGUMENT:
+                        pargs['hide_character'] = last_args['hide_character']
 
                 # Regardless of anything, pairing is visually canceled while in first person
                 # so set them to default values
@@ -644,8 +646,8 @@ def pop_if_there(dictionary, argument):
 
         def send_ic_others(
             self,
-            params: List = None,
-            sender: ClientManager.Client = None,
+            params: Dict[str, Any] = None,
+            sender: Union[ClientManager.Client, None] = None,
             bypass_text_replace: bool = False,
             bypass_deafened_starters: bool = False,
             use_last_received_sprites: bool = False,
diff --git a/server/clients.py b/server/clients.py
index 7161c43e..3cbae931 100644
--- a/server/clients.py
+++ b/server/clients.py
@@ -40,6 +40,7 @@ def __eq__(self, other):
     ALLOWS_INVISIBLE_BLANKPOSTS = True
     REPLACES_BASE_OPUS_FOR_MP3 = False
     ALLOWS_CHAR_LIST_RELOAD = True
+    HAS_HIDE_CHARACTER_AS_MS_ARGUMENT = True
 
     DECRYPTOR_OUTBOUND = [
         ('key', 34),  # 0
@@ -359,6 +360,7 @@ class ClientDRO1d0d0(DefaultDROProtocol):
     HAS_JOINED_AREA = False
     REPLACES_BASE_OPUS_FOR_MP3 = True
     ALLOWS_CHAR_LIST_RELOAD = False
+    HAS_HIDE_CHARACTER_AS_MS_ARGUMENT = False
 
     MS_INBOUND = [
         ('msg_type', ArgType.STR),  # 0
@@ -411,6 +413,7 @@ class ClientAO2d10(DefaultDROProtocol):
     ALLOWS_INVISIBLE_BLANKPOSTS = False
     REPLACES_BASE_OPUS_FOR_MP3 = True
     ALLOWS_CHAR_LIST_RELOAD = True
+    HAS_HIDE_CHARACTER_AS_MS_ARGUMENT = False
 
     MS_INBOUND = [
         ('msg_type', ArgType.STR),  # 0
diff --git a/server/commands.py b/server/commands.py
index 401ed1e2..2126058e 100644
--- a/server/commands.py
+++ b/server/commands.py
@@ -7476,7 +7476,7 @@ def ooc_cmd_randommusic(client: ClientManager.Client, arg: str):
 
     # Find all music tracks
     music_names = list()
-    music_list = client.music_manager.get_music_data()
+    music_list = client.music_manager.get_music()
 
     for item in music_list:
         songs = item['songs']
diff --git a/server/game_manager.py b/server/game_manager.py
index 59c36bf9..3331e175 100644
--- a/server/game_manager.py
+++ b/server/game_manager.py
@@ -1863,6 +1863,9 @@ def _check_structure(self):
         self._timer_manager._check_structure()
         self._team_manager._check_structure()
 
+        # 5.
+        super()._check_structure()
+
     def __str__(self):
         """
         Return a string representation of this game.
diff --git a/server/hub_manager.py b/server/hub_manager.py
index fb681d28..5700d47b 100644
--- a/server/hub_manager.py
+++ b/server/hub_manager.py
@@ -1898,7 +1898,7 @@ def __init__(
         self.area_manager = AreaManager(server, hub=self)
         self.load_areas()
 
-        self.trial_manager = TrialManager(self)
+        self.trial_manager = TrialManager(server)
 
         self._password = str(secrets.randbelow(9000) + 1000)  # Cute trick to get 4-digit number
 
diff --git a/server/tsuserver.py b/server/tsuserver.py
index 02d15324..1d354415 100644
--- a/server/tsuserver.py
+++ b/server/tsuserver.py
@@ -67,8 +67,8 @@ def __init__(self, client_manager_type: Type[ClientManager] = None):
         self.release = 5
         self.major_version = 0
         self.minor_version = 0
-        self.segment_version = 'post1'
-        self.internal_version = '221204a'
+        self.segment_version = 'post2'
+        self.internal_version = '221208a'
         version_string = self.get_version_string()
         self.software = 'TsuserverDR {}'.format(version_string)
         self.version = 'TsuserverDR {} ({})'.format(version_string, self.internal_version)