Graphical artifact after every Jira Portlet in Internet Explorer

System Info System Date Monday, 10 Nov 2008 System Time 09:45:22 Current Working Directory /usr/local/jira-enterprise-3.12.1/bin Java Version 1.6.0_04 Java Vendor Sun Microsystems Inc. JVM Version 1.0 JVM Vendor Sun Microsystems Inc. JVM Implementation Version 10.0-b19 Java Runtime Java(TM) SE Runtime Environment Java VM Java HotSpot(TM) Server VM User Name root User Timezone America/Los_Angeles User Locale English (United States) System Encoding UTF-8 Operating System Linux 2.6.22-14-generic OS Architecture i386 Application Server Container Apache Tomcat/5.5.20 Database type mysql Database JNDI address java:comp/env/jdbc/JiraDS Database URL jdbc:mysql://localhost/jiradb?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8 Database version 5.0.45-Debian_1ubuntu3.1-log Database driver MySQL-AB JDBC Driver mysql-connector-java-3.1.12 ( $Date: 2005-11-17 15:53:48 +0100 (Thu, 17 Nov 2005) $, $Revision$ ) External user management OFF