npviewer is a netscape plugin viewer. It enables flash in 64 bit firefox. I think the messages concerning npviewer is due to the fact that it is enabled also in konqueror (and is started by any webpage using flash) - however it does not work in konqueror (needs a special patched version of konqueror).
I have evaluated the options and do not think the screensaver and lockup problem is related to npviewer. The problems were there long time before installing npviewer. Are there more relevant info in some other log files maybe? -- screensaver (?) locks up computer or causes reboot https://launchpad.net/bugs/91132 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs