diff --git a/gtk2_ardour/themes/blueberry_milk-ardour.colors b/gtk2_ardour/themes/blueberry_milk-ardour.colors
index 8ffd6f6788..97fbb9d882 100644
--- a/gtk2_ardour/themes/blueberry_milk-ardour.colors
+++ b/gtk2_ardour/themes/blueberry_milk-ardour.colors
@@ -305,6 +305,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="alert:green"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/caineville-ardour.colors b/gtk2_ardour/themes/caineville-ardour.colors
index 27c46d9f4e..0aaa55b475 100644
--- a/gtk2_ardour/themes/caineville-ardour.colors
+++ b/gtk2_ardour/themes/caineville-ardour.colors
@@ -306,6 +306,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/clear_gray-ardour.colors b/gtk2_ardour/themes/clear_gray-ardour.colors
index 517af9b6cc..7a7fd2e8b4 100644
--- a/gtk2_ardour/themes/clear_gray-ardour.colors
+++ b/gtk2_ardour/themes/clear_gray-ardour.colors
@@ -306,6 +306,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="alert:red"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/cubasish-ardour.colors b/gtk2_ardour/themes/cubasish-ardour.colors
index 184f4c9999..80af3d7901 100644
--- a/gtk2_ardour/themes/cubasish-ardour.colors
+++ b/gtk2_ardour/themes/cubasish-ardour.colors
@@ -306,6 +306,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/dark-ardour.colors b/gtk2_ardour/themes/dark-ardour.colors
index 256de3a827..5ed6d9dd77 100644
--- a/gtk2_ardour/themes/dark-ardour.colors
+++ b/gtk2_ardour/themes/dark-ardour.colors
@@ -307,6 +307,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/diehard3-ardour.colors b/gtk2_ardour/themes/diehard3-ardour.colors
index c0ab9ce202..42f8ffe54c 100644
--- a/gtk2_ardour/themes/diehard3-ardour.colors
+++ b/gtk2_ardour/themes/diehard3-ardour.colors
@@ -307,6 +307,7 @@
     <ColorAlias name="pluginlist hide button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>    
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/recbox-ardour.colors b/gtk2_ardour/themes/recbox-ardour.colors
index 5ae331ee8a..fcb7d24b04 100644
--- a/gtk2_ardour/themes/recbox-ardour.colors
+++ b/gtk2_ardour/themes/recbox-ardour.colors
@@ -307,6 +307,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>    
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>
diff --git a/gtk2_ardour/themes/unastudia-ardour.colors b/gtk2_ardour/themes/unastudia-ardour.colors
index cf4286ab21..dbe4cfe275 100644
--- a/gtk2_ardour/themes/unastudia-ardour.colors
+++ b/gtk2_ardour/themes/unastudia-ardour.colors
@@ -305,6 +305,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>    
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:blue"/>
diff --git a/gtk2_ardour/themes/xcolors-ardour.colors b/gtk2_ardour/themes/xcolors-ardour.colors
index 4605f89e31..2bb3da05a8 100644
--- a/gtk2_ardour/themes/xcolors-ardour.colors
+++ b/gtk2_ardour/themes/xcolors-ardour.colors
@@ -306,6 +306,7 @@
     <ColorAlias name="pluginlist radio button: led active" alias="alert:cyan"/>
     <ColorAlias name="pluginui toggle: fill" alias="widget:bg"/>
     <ColorAlias name="pluginui toggle: fill active" alias="widget:blue"/>
+    <ColorAlias name="preference highlight" alias="alert:yellow"/>
     <ColorAlias name="processor automation line" alias="theme:bg1"/>
     <ColorAlias name="processor auxfeedback: fill" alias="theme:contrasting alt"/>
     <ColorAlias name="processor auxfeedback: led active" alias="alert:green"/>