diff --git a/diylc/diylc-core/src/org/diylc/netlist/Tree.java b/diylc/diylc-core/src/org/diylc/netlist/Tree.java
index c3ed0dc7..95cd1190 100644
--- a/diylc/diylc-core/src/org/diylc/netlist/Tree.java
+++ b/diylc/diylc-core/src/org/diylc/netlist/Tree.java
@@ -247,7 +247,7 @@ public class Tree {
         p2 = c;
     }   
     
-    if (p1 != p2)
+    if (p1 != p2 || p1 == this || p2 == this)
       return this;
     
     return p1.findCommonParent(t1, t2);
diff --git a/diylc/diylc-library/lib/diylc-core.jar b/diylc/diylc-library/lib/diylc-core.jar
index 8a6f8839..f633f9f9 100644
Binary files a/diylc/diylc-library/lib/diylc-core.jar and b/diylc/diylc-library/lib/diylc-core.jar differ
diff --git a/diylc/diylc-swing/build.xml b/diylc/diylc-swing/build.xml
index 45edaeb9..7b397b77 100644
--- a/diylc/diylc-swing/build.xml
+++ b/diylc/diylc-swing/build.xml
@@ -7,7 +7,7 @@
 	<property name="jar.dir" value="${build.dir}/jar" />
 	<property name="report.dir" value="${build.dir}/junitreport" />
 	<property name="main.class" value="org.diylc.DIYLCStarter" />
-	<property name="diylc.version" value="3.54.0" />
+	<property name="diylc.version" value="3.55.0" />
 
 	<property name="classes.dir" value="${build.dir}/temp/${ant.project.name}/classes" />
 	<property name="test.classes.dir" value="${build.dir}/temp/${ant.project.name}/test.classes" />
diff --git a/diylc/diylc-swing/lib/diylc-core.jar b/diylc/diylc-swing/lib/diylc-core.jar
index 8a6f8839..f633f9f9 100644
Binary files a/diylc/diylc-swing/lib/diylc-core.jar and b/diylc/diylc-swing/lib/diylc-core.jar differ