diff --git a/openpype/hosts/nuke/api/lib.py b/openpype/hosts/nuke/api/lib.py
index c05182ce97..e3b34222d4 100644
--- a/openpype/hosts/nuke/api/lib.py
+++ b/openpype/hosts/nuke/api/lib.py
@@ -2069,6 +2069,35 @@ class WorkfileSettings(object):
                 log.debug("nuke.root()['{}'] changed to: {}".format(
                     knob, value_))
 
+        # set ocio config path
+        if config_data:
+            current_ocio_path = os.getenv("OCIO")
+            if current_ocio_path != config_data["path"]:
+                message = """
+It seems like there's a mismatch between the OCIO config path set in your Nuke
+settings and the actual path set in your OCIO environment.
+
+To resolve this, please follow these steps:
+1. Close Nuke if it's currently open.
+2. Reopen Nuke.
+
+Please note the paths for your reference:
+
+- The OCIO environment path currently set:
+  `{env_path}`
+
+- The path in your current Nuke settings:
+  `{settings_path}`
+
+Reopening Nuke should synchronize these paths and resolve any discrepancies.
+"""
+                nuke.message(
+                    message.format(
+                        env_path=current_ocio_path,
+                        settings_path=config_data["path"]
+                    )
+                )
+
     def set_writes_colorspace(self):
         ''' Adds correct colorspace to write node dict
 
diff --git a/openpype/pipeline/colorspace.py b/openpype/pipeline/colorspace.py
index 1999ad3bed..269825f85f 100644
--- a/openpype/pipeline/colorspace.py
+++ b/openpype/pipeline/colorspace.py
@@ -375,7 +375,11 @@ def get_imageio_config(
     # This is for backward compatibility.
     # TODO: in future rewrite this to be more explicit
     activate_host_color_management = imageio_host.get(
-        "activate_host_color_management", True)
+        "activate_host_color_management")
+
+    # TODO: remove this in future - backward compatibility
+    if activate_host_color_management is None:
+        activate_host_color_management = host_ocio_config.get("enabled", False)
 
     if not activate_host_color_management:
         # if host settings are disabled return False because