Machines avail on Bonjour but not Local Network - when on same subnet?

I have a simple system running ARD 3.2 on a machine running OS X 10.5.2, controlling a small number of machines running 10.5.2 or 10.4.11, all on the same sub-net.
Two of the computers - both 20" Intel iMacs (2.0GHz CoreDuo) with 10.5.2 installed have an odd problem - most (but not all) of the time they show up in the ARD computers list as being available for Screen Sharing Only - and so things like copying files to the machine fail. Their entries have the 'light blue' icon next to them which appears to indicate this state.
When in this mode they initially fail to show up when I do a scan of the local network. They should - as they are running off the same Airport hub as the ARD controller. However, if I change the scan to look for Bonjour connected computers they show up. If I then go back to scanning the local network they show up there too. But still nothing more than the light blue icon and screen sharing only as an option.
I've checked the settings of both machines - both have ARD enabled in sharing, both have the firewall set to allow all incoming connections. Other machines connected to the same sub-net show up and can be used without problem. All the machines are running ARD client 3.2.1
Anyone got any ideas what might be going on?
Grateful for any advice / suggestions.
Message was edited by: Gavin Lawrie

Almost same setting here, same troubles.
If I restart them via Screen Sharing via the Restart Button on the Login Window, they sometimes show up correctly. But this is way too annoying.

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