I'm running Fedora 17, upgraded (through preupgrade) from 16.  The
installation is fully updated.  I use KDE, with 12 virtual desktops (though I
usually only have things open in 4 or 5 of them).  I have one panel, and the
only widgets running in the root window are the pager and a folder view that
shows only Home and Trash.  (Those are present on all the desktops.)

I've been encountering situations where I hit this error and new windows
refuse to open.  For instance, right now I have a console window with 2 tabs,
a claws-mail window (and the compose message window in which I'm writing
this), a firefox window, 2 emacs windows, and 3 pdf files open in okular.  At
this point, for instance, I can't open another file in okular, getting 
  "Maximum number of clients reachedokular: cannot connect to X server :0"

I did not have this problem with a similar workload on F16.

To run xlsclients, I have to close something; after quitting one of the
okular windows, xlsclients gives:

ext.math.umass.edu  kwin
ext.math.umass.edu  kded4
ext.math.umass.edu  kded4
ext.math.umass.edu  /usr/bin/kglobalaccel
ext.math.umass.edu  /usr/bin/kglobalaccel
ext.math.umass.edu  /usr/bin/kwalletd
ext.math.umass.edu  /usr/bin/kwalletd
ext.math.umass.edu  ksmserver
ext.math.umass.edu  ksmserver
ext.math.umass.edu  kwin
ext.math.umass.edu  kwin
ext.math.umass.edu  /usr/bin/kactivitymanagerd
ext.math.umass.edu  kwin
ext.math.umass.edu  kwin
ext.math.umass.edu  /usr/bin/knotify4
ext.math.umass.edu  /usr/bin/knotify4
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/kuiserver
ext.math.umass.edu  /usr/bin/kuiserver
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/kaccess
ext.math.umass.edu  /usr/bin/krunner
ext.math.umass.edu  /usr/bin/krunner
ext.math.umass.edu  /usr/bin/krunner
ext.math.umass.edu  /usr/bin/krunner
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/akonadi_nepomuk_feeder
ext.math.umass.edu  /usr/bin/akonadi_nepomuk_feeder
ext.math.umass.edu  /usr/bin/akonadi_maildispatcher_agent
ext.math.umass.edu  /usr/bin/akonadi_maildispatcher_agent
ext.math.umass.edu  /usr/bin/akonadi_mailfilter_agent
ext.math.umass.edu  /usr/bin/akonadi_mailfilter_agent
ext.math.umass.edu  kmix
ext.math.umass.edu  kmix
ext.math.umass.edu  kmix
ext.math.umass.edu  kmix
ext.math.umass.edu  /usr/bin/nepomukcontroller
ext.math.umass.edu  /usr/bin/nepomukcontroller
ext.math.umass.edu  kmix
ext.math.umass.edu  konsole
ext.math.umass.edu  konsole
ext.math.umass.edu  kmix
ext.math.umass.edu  konsole
ext.math.umass.edu  kded4
ext.math.umass.edu  /usr/libexec/kde4/polkit-kde-authentication-agent-1
ext.math.umass.edu  /usr/libexec/kde4/polkit-kde-authentication-agent-1
ext.math.umass.edu  /usr/bin/rsibreak
ext.math.umass.edu  /usr/bin/rsibreak
ext.math.umass.edu  /usr/bin/knemo
ext.math.umass.edu  /usr/bin/knemo
ext.math.umass.edu  /usr/bin/knemo
ext.math.umass.edu  /usr/bin/printer-applet
ext.math.umass.edu  /usr/bin/printer-applet
ext.math.umass.edu  /usr/bin/klipper
ext.math.umass.edu  /usr/bin/klipper
ext.math.umass.edu  /usr/bin/klipper
ext.math.umass.edu  /usr/bin/printer-applet
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/krunner
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  okular
ext.math.umass.edu  okular
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  /usr/bin/rsibreak
ext.math.umass.edu  abrt-applet
ext.math.umass.edu  claws-mail
ext.math.umass.edu  seapplet
ext.math.umass.edu  emacs
ext.math.umass.edu  firefox
ext.math.umass.edu  gnome-settings-daemon
ext.math.umass.edu  okular
ext.math.umass.edu  okular
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  konsole
ext.math.umass.edu  /usr/bin/plasma-desktop
ext.math.umass.edu  kmix

(Why are there all those instances of plasma-desktop?)

Any suggestions about what to do, other than just open fewer windows?

Thanks,

   George


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