If thine Leopard's tail offends thee - whack it off!!!
(and rename him "Bob") 🙂
{No wild life was harmed in the making of this joke}
After 3 leopard reinstalls (upgrade), numerous permission and acl permission troubles, programs behaving badly (failure to start, jerky video, crashes, etc.) I came to the conclusion that the Apple's Remote management 3.2.1 upgrade was the culprit. Every time after I applied the upgrade, the aforementioned problem cycle would begin all over again.
So I dug around at Apple Support and found instructions on how to delete the ARDAgent App.
After deleting the app, everything stabilized and began running correctly.
If you are one of the lucky ones who upgraded the RM Client and are having trouble, then I suggest you remove the ARDAgent.app and reinstall the original one that came with Leopard.
To re-install: Delete the /System/Library/CoreServices/RemoteManagement/ARDAgent.app
Download and install Pacifist 2.5.1
http://www.charlessoft.com/
Using Pacifist: search and locate ARDAgent.app on the leopard DVD.
Re-install the ARDAgentapp in the default location - reboot - Enjoy!