In the past, my coworkers have just wiped and reloaded OS X to fix this issue, which is kind of an unacceptable solution in my mind. Just this morning I got hit with the same issues trying to remote into some servers -- the application just hung, and it would lock and I would have to force quit it. I did not want to reload OS X to fix this issue, so I went looking for another solution.
You can't simply trash the ARD Admin application and then reinstall it; that does not work, as ARD Admin puts files and resources in many places. I have compiled a script, which I use in OS X 10.5 with ARD Admin 3.2. The script removes all resources that ARD admin installs on your system, and allows you to reinstall the application like it was a clean install. Here's the code:
#!/bin/sh IFS=$'\t\n' PATH=/bin:/usr/bin export PATH home=~ list=" # Remote Desktop Application /Applications/Remote Desktop.app # ARD Agent Software /System/Library/CoreServices/RemoteManagement /System/Library/CoreServices/Menu Extras/RemoteDesktop.menu # Application Support Files /Library/Application Support/Apple/Remote Desktop # Preferences /Library/Preferences/com.apple.ARDAgent.plist /Library/Preferences/com.apple.RemoteDesktop.plist /Library/Preferences/com.apple.RemoteManagement.launchd /Library/Preferences/com.apple.RemoteManagement.plist # Receipts /Library/Receipts/RemoteDesktopAdmin320.pkg /Library/Receipts/RemoteDesktopAdmin322.pkg /Library/Receipts/RemoteDesktopClient.pkg /Library/Receipts/RemoteDesktopRMDB.pkg # User Items $home/Library/Application Support/Remote Desktop $home/Library/Preferences/com.apple.RemoteDesktop.plist # Reporting Database /var/db/RemoteManagement " for file in $list do if [[ -e $file ]] then rm -rf $file fi done exit

