Hi, Running "Windowed" applications on Gnome desktop. I was getting occasional desktop application failures under FC4 kernel 2.6.12-1.1398_FC4. The symptoms were the applicaiton window would just close - no error messages. The failing application was normally Firefox, sometimes Mozilla. After one application window closure, sometimes it became impossible to open applications. When I clicked on the icon the hour glass would appear for a few seconds then disappear. The system sometimes needed to reboot to recover all the applications. I have searched through all the log files in directory /var/log and there are no error messages that indicate the cause of the problem. I have just applied the latest Fedora 4 maintenance After applying the latest Fedora package maintenance windows close more frequently (every 30 minutes) - and a wider range of applications. Nautilus for example, or various "gnome-" applications. I sometimes get a pop-up window occurring that says "rhn-applet failed". In this state it is impossible to launch any application. Where can I find application error info or set more intensive logging on? None of the log files in /var/log show any indication that the problem has occurred let along any diagnostics. Thanks Clive