diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64eb99e..5b5de6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,11 @@ Activate / deactivate layer opacity according to prefix
 Activate / deactivate all masks using MA layers
 -->
 
+1.1.4
+
+- changed: force set color by prefix if autobuild option swiched on
+- fixed: problem with auto merge adjacent layers
+
 1.1.3
 
 - added: clean material stack in auto-build
diff --git a/OP_auto_build.py b/OP_auto_build.py
index 6aacdf3..6e78ffd 100644
--- a/OP_auto_build.py
+++ b/OP_auto_build.py
@@ -58,7 +58,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
     timer : bpy.props.FloatProperty(default=0.1, options={'SKIP_SAVE'})
 
     excluded_prefix : bpy.props.StringProperty(
-        name='Excluded Layer By Prefix', default='GP, RG, PO',
+        name='Excluded Layer By Prefix', default='GP, RG, PO, MA',
         description='Exclude layer to send to render by prefix (comma separated list)')
 
     clean_name_and_visibility : bpy.props.BoolProperty(name='Clean Name And Visibility', default=True, 
@@ -101,10 +101,11 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         layout = self.layout
         col = layout.column()
         col.prop(self, 'clean_name_and_visibility')
-        col.prop(self, 'clean_material_duplication')
         row = col.row()
         row.prop(self, 'prefix_filter')
         row.active = self.clean_name_and_visibility
+        
+        col.prop(self, 'clean_material_duplication')
 
         col.prop(self, 'set_layers_colors')
         col.prop(self, 'trigger_rename_lowercase')
@@ -127,6 +128,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
         # TODO : add to preferences / environment var
         # prefix_to_render = ['CO', 'CU', 'FX', 'TO', 'MA']
         prefix_to_render = [p.strip() for p in self.prefix_filter.split(',')]
+        print('prefix_to_render: ', prefix_to_render)
 
         render_scn = bpy.data.scenes.get('Render')
         if render_scn:
@@ -134,6 +136,7 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
             return {'CANCELLED'}
         
         all_gp_objects = [o for o in context.scene.objects if o.type == 'GPENCIL']
+        
         ## clean name and visibility
         if self.clean_name_and_visibility:
             for o in all_gp_objects:
@@ -145,9 +148,9 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
                     if re.match(r'^[A-Z]{2}_$', l.info):
                         l.info = l.info + o.name.lower()
                     
-                    ## Make used prefix visible ?
+                    ## Make used prefix visible ?? (maybe some layer were intentionally hidden...)
                     if (res := re.search(r'^([A-Z]{2})_', l.info)):
-                        if res.group(1) in prefix_to_render and l.hide == True:
+                        if res.group(1) in prefix_to_render and l.hide == True and not 'invisible' in l.info:
                             print(f'{o.name} -> {l.info} : Switch visibility On')
                             l.hide = False
 
@@ -167,8 +170,9 @@ class GPEXP_OT_render_auto_build(bpy.types.Operator):
 
         ## Set layers colors (skip if colors were already set ?)
         if self.set_layers_colors:
-            # Option: Maybe find a way to create a color from prefix hash ? (always give unique color with same prefix on other project!)
-            fn.set_layer_colors(skip_if_colored=True)
+            ## Option: Maybe find a way to create a color from prefix hash ?
+            ## (always give unique color with same prefix whatever the project!)
+            fn.set_layer_colors(skip_if_colored=False)
 
         ## Trigger rename lowercase
         if self.trigger_rename_lowercase:
diff --git a/__init__.py b/__init__.py
index 40d3144..d23fc8f 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,7 +2,7 @@ bl_info = {
     "name": "GP Render",
     "description": "Organise export of gp layers through compositor output",
     "author": "Samuel Bernou",
-    "version": (1, 1, 3),
+    "version": (1, 1, 4),
     "blender": (2, 93, 0),
     "location": "View3D",
     "warning": "",
diff --git a/fn.py b/fn.py
index dfdb776..7cb476b 100644
--- a/fn.py
+++ b/fn.py
@@ -437,12 +437,20 @@ def group_adjacent_layer_prefix_rlayer(ob, excluded_prefix=[], first_name=True):
     ]
 
     for prefix, layer_grp in adjacent_prefix_groups:
+        ## Remove layer that are in excluded viewlayer
+        ## Else None/exclusion vl can expand rest of the adjacent layers
+        for l in reversed(layer_grp):
+            if not l.viewlayer_render or l.viewlayer_render == 'exclude':
+                print(f'prefix "{prefix}": remove "{l.info}" from grouping adjacent layers')
+                layer_grp.remove(l) # remove traget the layer directly
+
         if len(layer_grp) < 2:
             continue
         if not prefix or prefix in excluded_prefix:
             continue
 
         ref = layer_grp[0] if first_name else layer_grp[-1]
+
         merge_gplayer_viewlayers(ob, act=ref, layers=layer_grp)
 
 
diff --git a/gen_vlayer.py b/gen_vlayer.py
index b004acc..9047793 100644
--- a/gen_vlayer.py
+++ b/gen_vlayer.py
@@ -379,12 +379,15 @@ def export_gp_objects(oblist, exclude_list=[], scene=None):
         oblist = [oblist]
     if isinstance(exclude_list, str):
         exclude_list = [p.strip() for p in exclude_list.split(',')]
+    
+    # print('exclude_list: ', exclude_list)
 
     for ob in oblist:
         for l in ob.data.layers:
             # if l.hide: 
             #     continue
             if l.hide or any(x + '_' in l.info for x in exclude_list): # exclude hided ?
+                print(f'Exclude export: {ob.name} : {l.info}')
                 l.viewlayer_render = fn.get_view_layer('exclude', scene=scene).name # assign "exclude"
                 continue