We recently upgraded from iReport 3.0 to iReport 3.6 The upgrade went well and we currently have 3.6 deployed across a wide range of servers, most all of them Windows. We did a deployment today on Solaris environment and when we go to run a report we get the following error: net.sf.jasperreports.engine.JRRuntimeException: java.io.FileNotFoundException: JAR entry jasperreports_extension.properties not found in /PROD/apache-tomcat-5.5.17/webapps/prod/WEB-INF/lib/jasperreports.jar Has anyone seen this issue before? Note that we re-named jasperreports-3.6.1.jar to jasperreports.jar to keep it consistent with our previous naming convention, but that should not cause the problem. And help is greatly appreciated, thank you!