I'm getting the error java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup)... when I try to load an applet to Netscape 4.61 off one of my subdirectories. The line that triggers the error is new Thread(this).start(); The problem seems to have something to do with the location of the class files, because I have no problem loading the applet when the class files are in a subdirectory in the JDK installation tree (/usr/local/jdk1.3.1). Also, the applet performs fine if I run it using appletviewer, even off my subdirectory. Can someone guess why I'm getting this error? Thanks! KJ p.s. The full error message is: java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup) at java.security.AccessControlContext.checkPermission(AccessControlConte xt.java:272) at java.security.AccessController.checkPermission(AccessController.java: 399) at java.lang.SecurityManager.checkPermission(SecurityManager.java:545) at sun.applet.AppletSecurity.checkAccess(AppletSecurity.java:139) at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:279) at java.lang.Thread.init(Thread.java:265) at java.lang.Thread.<init>(Thread.java:345) at XYZApp.start(XYZApp.java:346) at sun.applet.AppletPanel.run(AppletPanel.java:358) at sun.plugin.navig.motif.MotifAppletViewer.maf_run(MotifAppletViewer.java:127) at sun.plugin.navig.motif.MotifAppletViewer.run(MotifAppletViewer.java:1 23) at java.lang.Thread.run(Thread.java:484)