Leopard does actually not repair any disc permissions, that's why there is no moving progress bar and thats why nobody gets a list of repaired permissions. The utility does eventually give the message that permissions have been repaired, but in reality nothing has happened.
Even after removing the ARD agent application, yes the error message disappears but no permissions are being repaired and after the progress bar flashes for up to 20 min (depending on your system), no progress is being made, no permissions are being repaired.
This is a serious issue and hopefully Apple will post a fix soon.
If you check "Show Details" at the top of the log window you will, in fact, get a list of permissions DU has repaired.
I also get all three odd errors as noted above.