diff --git a/core/modules/filters/filter.js b/core/modules/filters/filter.js
index 5923d48a0..bf11560ce 100644
--- a/core/modules/filters/filter.js
+++ b/core/modules/filters/filter.js
@@ -14,7 +14,7 @@ Export our filter function
 */
 exports.filter = function(source,operator,options) {
 	var suffixes = operator.suffixes || [],
-		defaultFilterRunPrefix = (suffixes[0] || [options.defaultFilterRunPrefix] || [])[0] || "or",
+		defaultFilterRunPrefix = (suffixes[0] && suffixes[0][0]) || options.defaultFilterRunPrefix || "or",
 		filterFn = options.wiki.compileFilter(operator.operand,{defaultFilterRunPrefix}),
 		results = [],
 		target = operator.prefix !== "!";
diff --git a/core/modules/filters/subfilter.js b/core/modules/filters/subfilter.js
index 4f428ef7d..2c1a631ff 100644
--- a/core/modules/filters/subfilter.js
+++ b/core/modules/filters/subfilter.js
@@ -14,7 +14,7 @@ Export our filter function
 */
 exports.subfilter = function(source,operator,options) {
 	var suffixes = operator.suffixes || [],
-		defaultFilterRunPrefix = (suffixes[0] || [options.defaultFilterRunPrefix] || [])[0] || "or";
+		defaultFilterRunPrefix = (suffixes[0] && suffixes[0][0]) || options.defaultFilterRunPrefix || "or";
 	var list = options.wiki.filterTiddlers(operator.operand,options.widget,source,{defaultFilterRunPrefix});
 	if(operator.prefix === "!") {
 		var results = [];
diff --git a/core/wiki/macros/CSS.tid b/core/wiki/macros/CSS.tid
index b13a091d2..4bb869f51 100644
--- a/core/wiki/macros/CSS.tid
+++ b/core/wiki/macros/CSS.tid
@@ -2,6 +2,7 @@ title: $:/core/macros/CSS
 tags: $:/tags/Macro
 
 \procedure actions-compile-palette-filtered(consolidatedPalette,outputPalette)
+<!-- The $:/config/DefaultColourMappings/ fallback used below is unused by the core and is retained for compatibility with third party plugins -->
 <!-- Note the join, needed to cope with palette entries containing spaces -->
 \function tf.colour(name) [<consolidatedPalette>getindex<name>] :else[[$:/config/DefaultColourMappings/]addsuffix<name>get[text]] :map[tf.colour-inner-transform-classic-palette-entry<currentTiddler>] :map[subfilter:all<currentTiddler>join[ ]]
 \function colour(name) [tf.colour<name>]
@@ -83,12 +84,6 @@ tags: $:/tags/Macro
 <$transclude $variable="actions-compile-palette" inputPalette={{$:/palette}} outputPalette="$:/temp/palette-colours"/>
 \end actions-recompile-current-palette
 
-\procedure actions-switch-colour-palette(paletteTitle)
-\procedure tv-action-refresh-policy() always
-<$action-deletetiddler $tiddler="$:/temp/palette-colours"/>
-<<actions-recompile-current-palette>>
-\end actions-switch-colour-palette
-
 \procedure tv-palette-name() $:/temp/palette-colours
 
 \function tf.colour(name)