diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8815163..5912f61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+4.0.1
+
+- fixed: layer nav operator on page up/down
+
+4.0.0
+
+- changed: version for Blender 4.3 - Breaking retrocompatibility with previous.
+
 3.3.0
 
 - added: `Move Material To Layer` has now option to copy instead of moving in pop-up menu.
diff --git a/GP_guided_colorize/OP_create_empty_frames.py b/GP_guided_colorize/OP_create_empty_frames.py
index 1fe1c2f..2ca5fe3 100644
--- a/GP_guided_colorize/OP_create_empty_frames.py
+++ b/GP_guided_colorize/OP_create_empty_frames.py
@@ -5,6 +5,7 @@ from bpy.props import (FloatProperty,
                         EnumProperty,
                         StringProperty,
                         IntProperty)
+from .. import utils
 
 ## copied from OP_key_duplicate_send
 def get_layer_list(self, context):
@@ -14,12 +15,6 @@ def get_layer_list(self, context):
 def get_group_list(self, context):
     return [(g.name, g.name, '') for g in context.object.data.layer_groups]
 
-def get_top_layer_from_group(gp, group):
-    upper_layer = None
-    for layer in gp.layers:
-        if layer.parent_group == group:
-            upper_layer = layer
-    return upper_layer
 
 class GP_OT_create_empty_frames(bpy.types.Operator):
     bl_idname = "gp.create_empty_frames"
@@ -84,7 +79,8 @@ class GP_OT_create_empty_frames(bpy.types.Operator):
         gp = context.grease_pencil
         layer_from_group = None
         if gp.layer_groups.active:
-            layer_from_group = get_top_layer_from_group(gp, gp.layer_groups.active)
+            layer_from_group = utils.get_top_layer_from_group(gp, gp.layer_groups.active)
+        ## Can just do if not utils.get_closest_active_layer(context.grease_pencil):
         if not gp.layers.active and not layer_from_group:
             self.report({'ERROR'}, 'No active layer or active group containing layer on GP object')
             return {'CANCELLED'}
@@ -126,7 +122,7 @@ class GP_OT_create_empty_frames(bpy.types.Operator):
         gpl = gp.layers
 
         if gp.layer_groups.active:
-            reference_layer = get_top_layer_from_group(gp, gp.layer_groups.active)
+            reference_layer = utils.get_top_layer_from_group(gp, gp.layer_groups.active)
         else:
             reference_layer = gpl.active
 
diff --git a/OP_layer_nav.py b/OP_layer_nav.py
index b5e9306..918662f 100644
--- a/OP_layer_nav.py
+++ b/OP_layer_nav.py
@@ -26,10 +26,11 @@ class GPT_OT_layer_nav(bpy.types.Operator):
         prefs = utils.get_addon_prefs()
         if not prefs.nav_use_fade:
             if self.direction == 'DOWN':
-                utils.iterate_selector(context.object.data.layers, 'active_index', -1, info_attr = 'name')
+                utils.iterate_active_layer(context.grease_pencil, -1)
+                # utils.iterate_selector(context.object.data.layers, 'active_index', -1, info_attr = 'name') # gpv2
 
             if self.direction == 'UP':
-                utils.iterate_selector(context.object.data.layers, 'active_index', 1, info_attr = 'name')
+                utils.iterate_active_layer(context.grease_pencil, 1)
             return {'FINISHED'}
         
         ## get up and down keys for use in modal
@@ -91,12 +92,11 @@ class GPT_OT_layer_nav(bpy.types.Operator):
                 context.space_data.overlay.gpencil_fade_layer = fade
 
         if self.direction == 'DOWN' or ((event.type in self.down_keys) and event.value == 'PRESS'):
-            _val = utils.iterate_selector(context.object.data.layers, 'active_index', -1, info_attr = 'name')
+            _val = utils.iterate_active_layer(context.grease_pencil, -1)
             trigger = True
 
         if self.direction == 'UP' or ((event.type in self.up_keys) and event.value == 'PRESS'):
-            _val = utils.iterate_selector(context.object.data.layers, 'active_index', 1, info_attr = 'name')
-            # utils.iterate_selector(bpy.context.scene.grease_pencil.layers, 'active_index', 1, info_attr = 'name')#layers
+            _val = utils.iterate_active_layer(context.grease_pencil, 1)
             trigger = True
 
         if trigger:
diff --git a/__init__.py b/__init__.py
index d71a6bd..7030933 100755
--- a/__init__.py
+++ b/__init__.py
@@ -4,7 +4,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Tool set for Grease Pencil in animation production",
 "author": "Samuel Bernou, Christophe Seux",
-"version": (4, 0, 0),
+"version": (4, 0, 1),
 "blender": (4, 3, 0),
 "location": "Sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",
@@ -336,7 +336,7 @@ class GPTB_prefs(bpy.types.AddonPreferences):
     nav_fade_val : FloatProperty(
         name='Fade Value',
         description='Fade value for other layers when navigating (0=invisible)',
-        default=0.35, min=0.0, max=0.95, step=1, precision=2)
+        default=0.1, min=0.0, max=0.95, step=1, precision=2)
     
     nav_limit : FloatProperty(
         name='Fade Duration',
diff --git a/utils.py b/utils.py
index 7040ef8..6fae8c8 100644
--- a/utils.py
+++ b/utils.py
@@ -162,6 +162,33 @@ def layer_active_index(gpl):
     '''
     return next((i for i, l in enumerate(gpl) if l == gpl.active), None)
 
+def get_top_layer_from_group(gp, group):
+    upper_layer = None
+    for layer in gp.layers:
+        if layer.parent_group == group:
+            upper_layer = layer
+    return upper_layer
+
+def get_closest_active_layer(gp):
+    '''Get active layer from GP object, getting upper layer if in group
+    if a group is active, return the top layer of this group
+    if group is active but no layer in it, return None
+    '''
+
+    if gp.layers.active:
+        return gp.layers.active
+    ## No active layer, return active from group (can be None !)
+    return get_top_layer_from_group(gp, gp.layer_groups.active)
+
+def closest_layer_active_index(gp, fallback_index=0):
+    '''Get active layer index from GP object, getting upper layer if in group
+    if a group is active, return index at the top layer of this group
+    if group is active but no layer in it, return fallback_index (0 by default, stack bottom)'''
+    closest_active_layer = get_closest_active_layer(gp)
+    if closest_active_layer:
+        return next((i for i, l in enumerate(gp.layers) if l == closest_active_layer), fallback_index)
+    return fallback_index
+
 ## Check for nested lock
 def is_locked(stack_item):
     '''Check if passed stack item (layer or group) is locked
@@ -1200,6 +1227,38 @@ def iterate_selector(zone, attr, state, info_attr = None, active_access='active'
 
         return info, bottom
 
+def iterate_active_layer(gpd, state):
+    '''Iterate active GP layer in stack
+    gpd: Grease Pencil Data
+    '''
+    layers = gpd.layers
+    l_count = len(layers)
+    
+    if state: # swap
+        # info = None
+        # bottom = None
+        
+        ## Get active layer index
+        active_index = closest_layer_active_index(gpd, fallback_index=None)
+        if active_index == None:
+            ## fallback to first layer if nothing found
+            gpd.layers.active = layers[0]
+            return
+
+        target_index = active_index + state
+        new_index = target_index % l_count
+
+        ## set active layer        
+        gpd.layers.active = layers[new_index]
+
+        if target_index == l_count:
+            bottom = 1 # bottom reached, cycle to first
+        elif target_index < 0:
+            bottom = -1 # up reached, cycle to last
+
+        # info = gpd.layers.active.name
+        # return info, bottom
+
 # -----------------
 ### Curve handle
 # -----------------