diff --git a/Source/Element/Element.js b/Source/Element/Element.js
index 6aa5a9e41..7aabc0ace 100644
--- a/Source/Element/Element.js
+++ b/Source/Element/Element.js
@@ -436,7 +436,7 @@ Object.each(inserters, function(inserter, where){
 var injectCombinator = function(expression, combinator){
 	if (!expression) return combinator;
 
-	expression = Slick.parse(expression);
+	expression = Object.clone(Slick.parse(expression));
 
 	var expressions = expression.expressions;
 	for (var i = expressions.length; i--;)
diff --git a/Source/Slick/Slick.Finder.js b/Source/Slick/Slick.Finder.js
index 3034d81e9..3d6b3b7ab 100644
--- a/Source/Slick/Slick.Finder.js
+++ b/Source/Slick/Slick.Finder.js
@@ -614,11 +614,11 @@ var pseudos = {
 		return this['pseudo:nth-child'](node, '' + index + 1);
 	},
 
-	'even': function(node, argument){
+	'even': function(node){
 		return this['pseudo:nth-child'](node, '2n');
 	},
 
-	'odd': function(node, argument){
+	'odd': function(node){
 		return this['pseudo:nth-child'](node, '2n+1');
 	},
 
diff --git a/Source/Slick/Slick.Parser.js b/Source/Slick/Slick.Parser.js
index 2ad28d86a..e112a638e 100644
--- a/Source/Slick/Slick.Parser.js
+++ b/Source/Slick/Slick.Parser.js
@@ -27,9 +27,10 @@ var parse = function(expression, isReversed){
 		return parse(this.raw, true);
 	}};
 	separatorIndex = -1;
+	var cacheKey = expression;
 	while (expression != (expression = expression.replace(regexp, parser)));
 	parsed.length = parsed.expressions.length;
-	return currentCache[expression] = (reversed) ? reverse(parsed) : parsed;
+	return currentCache[cacheKey] = (reversed) ? reverse(parsed) : parsed;
 };
 
 var reverseCombinator = function(combinator){