Comment 2 for bug 924304

Right now this problem is happening again.
I've executed this python script: http://lists.fedoraproject.org/pipermail/test/2009-May/081959.html
And this is the result:
gnome-session 17176 simon 3u unix 0x0000000000000000 0t0 111483193 socket
dbus-launch 17215 simon 3u unix 0x0000000000000000 0t0 111485014 socket
dbus-launch 17215 simon 8u unix 0x0000000000000000 0t0 111484348 socket
gnome-screensav 17251 simon 3u unix 0x0000000000000000 0t0 111485111 socket
gnome-shell 17253 simon 6u unix 0x0000000000000000 0t0 111485124 socket
pulseaudio 17262 simon 29u unix 0x0000000000000000 0t0 111479309 socket
gnome-shell-goo 17283 simon 4u unix 0x0000000000000000 0t0 111484596 socket
wally 17294 simon 6u unix 0x0000000000000000 0t0 111484587 socket
wally 17294 simon 8u unix 0x0000000000000000 0t0 111484591 socket
kupfer 17295 simon 4u unix 0x0000000000000000 0t0 111485411 socket
thunderbird-bin 17300 simon 4u unix 0x0000000000000000 0t0 111486117 socket
gpasted 17310 simon 3u unix 0x0000000000000000 0t0 111484668 socket
python 17312 simon 4u unix 0x0000000000000000 0t0 111484676 socket
shutter 17317 simon 4u unix 0x0000000000000000 0t0 110410686 socket
gnote 17319 simon 3u unix 0x0000000000000000 0t0 110410685 socket
dropbox 17327 simon 10u unix 0x0000000000000000 0t0 111484856 socket
zim 17343 simon 15u unix 0x0000000000000000 0t0 111479208 socket
python 17457 simon 33u unix 0x0000000000000000 0t0 111467260 socket
gdu-notificatio 17655 simon 3u unix 0x0000000000000000 0t0 111485653 socket
applet.py 17784 simon 6w unix 0x0000000000000000 0t0 111486223 socket
gwibber-service 17786 simon 11u unix 0x0000000000000000 0t0 111485834 socket
ubuntuone-syncd 17842 simon 26u unix 0x0000000000000000 0t0 111486235 socket
gwibber-service 17844 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17845 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17846 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17847 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17848 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17849 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17850 simon 11u unix 0x0000000000000000 0t0 111485834 socket
gwibber-service 17851 simon 11u unix 0x0000000000000000 0t0 111485834 socket
update-notifier 17963 simon 3u unix 0x0000000000000000 0t0 111489025 socket
firefox 30571 simon 4w unix 0x0000000000000000 0t0 161112423 socket
firefox 30571 simon 85u unix 0x0000000000000000 0t0 162084827 socket
gnome-settings- 31023 simon 3u unix 0x0000000000000000 0t0 161861436 socket
plugin-containe 31170 simon 13u unix 0x0000000000000000 0t0 162084827 socket

But when I execute:
$ xlsclients
Maximum number of clients reachedxlsclients: unable to open display ":0"

$ xrestop
Maximum number of clients reachedxrestop: Unable to open display!

$ xwininfo -root
Maximum number of clients reachedxwininfo: error: unable to open display ":0"

What's the problem?