ARDAgent is a big crash o holic

Over the weekend ARD has decided to not work anymore.

Visiting the system log I get this every 5-7 seconds.

Jan 24 14:03:00 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: ********Launched Agent********
Jan 24 14:03:00 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: Agent: Unable to get existing shared memory 22 Invalid argument
Jan 24 14:03:00 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: Agent: Unable to create new shared memory 22 Invalid argument
Jan 24 14:03:08 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: ********Launched Agent********
Jan 24 14:03:09 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: Agent: Unable to get existing shared memory 22 Invalid argument
Jan 24 14:03:09 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: Agent: Unable to create new shared memory 22 Invalid argument
Jan 24 14:03:17 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: ********Launched Agent********
Jan 24 14:03:17 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: Agent: Unable to get existing shared memory 22 Invalid argument
Jan 24 14:03:17 localhost /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent: Agent: Unable to create new shared memory 22 Invalid argument

I tried uninstalling, rebooting, reinstalling, fixing permissions (both in OS X 10.3.9 or via DVD) and the darn thing just wont work.

specs are a powermac g5 1.8, 3gb of memory, 2x 250gb hard drives. machine was working fine a few days ago.

Yvo