abrt version: 1.1.14
architecture: x86_64
cmdline: python /usr/bin/hp-systray --force-startup
component: hplip
executable: /usr/bin/hp-systray
kernel: 2.6.35.6-48.fc14.x86_64
package: hplip-gui-3.10.9-5.fc14
reason: systemtray.py:665:notifierActivated:GError: Unable to connect to server
release: Fedora release 14 (Laughlin)
time: 1293320580
uid: 500

backtrace
-----
systemtray.py:665:notifierActivated:GError: Unable to connect to server

Traceback (most recent call last):
  File "/usr/share/hplip/ui4/systemtray.py", line 665, in notifierActivated
    n.show()
GError: Unable to connect to server

Local variables in innermost frame:
icon: 'file:///usr/share/hplip/data/images/32x32/info.png'
show_message: True
back_end: 'hp'
serial: ''
event: <base.device.Event object at 0x20fb950>
self: <ui4.systemtray.SystemTrayApp object at 0x1f876b0>
port: 1
msg: u'PSC_500 Printer (/dev/parport1)\nIdle (1000)'
error_state: 0
is_hp: True
bus: 'par'
host: ''
zc: ''
idd: '/dev/parport1'
desc: 'Idle'
dev_file: '/dev/parport1'
e: []
d: PyQt4.QtCore.QString(u'PSC_500 Printer (/dev/parport1)')
m: ''
n: <pynotify.Notification object at 0x20d9d20 (NotifyNotification at 0x2093b80)>
s: 5
r: [5]
w: []
model: 'PSC_500'
urgency: <enum NOTIFY_URGENCY_LOW of type NotifyUrgency>

How to reproduce
-----
1. Try to scan with $scanimage >image.png
2.
3.