Windows Update icon not appearing

I have a server (it happens to be the actual WUS server) that does not
display the automatic updates icon in the system tray, despite requiring
updates, and those updates set to install. Something's got to be working as
WUS knows that the server requires updates, and the automatic updates tab is
greyed out in My Computer properties.

The server in question is W2K3 SP1 and the settings are defined by GPO.
Other servers are displaying the icon correctly, including one other WUS
server.

I've tried kicking the server using a Microsoft Script:

@echo off
Echo This batch file will Force the Update Detection from the AU client:
Echo 1. Stops the Automatic Updates Service (wuauserv)
Echo 2. Deletes the LastWaitTimeout registry key (if it exists)
Echo 3. Deletes the DetectionStartTime registry key (if it exists)
Echo 4. Deletes the NextDetectionTime registry key (if it exists)
Echo 5. Restart the Automatic Updates Service (wuauserv)
Echo 6. Force the detection
Pause
@echo on
net stop wuauserv
REG DELETE
"HKLM\Software\Microsoft\Windows\CurrentVersion\Wi ndowsUpdate\Auto Update" /v
LastWaitTimeout /f
REG DELETE
"HKLM\Software\Microsoft\Windows\CurrentVersion\Wi ndowsUpdate\Auto Update" /v
DetectionStartTime /f
Reg Delete
"HKLM\Software\Microsoft\Windows\CurrentVersion\Wi ndowsUpdate\Auto Update" /v
NextDetectionTime /f
net start wuauserv
wuauclt /detectnow
@echo off
Echo This AU client will now check for the Updates on the Local WSUS Server.
Pause

No joy either using this script. It seems the lights are on at the
Automatic Updates household, but nobody is at home. Any ideas?

Thanks,

Peter