Trouble Connecting to new iMac computers

Hey Everyone,
We have been using remote desktop for the past few years. We currently have version 3.4.
We recently purchased a classroom of new iMacs running 10.6.7. We named and set them up for Remote Management, and allowed access and managed the options to observe, control, generate reports etc.... Like we have for all our other machines.
I can see these new machines  on my ARD scanner, but can not control them.. I can't enter the admin user name and password under info.. it is all grayed/blanked out:
This is only happening on my new machines.. We have other 10.6.7 iMacs running fine, without this issue.
Any ideas?  Our machines are assigned IPs through a DNS Server.
Thanks so much for any advice.
-Vicky

Are the new workstations on a different subnet from workstations that are working correctly in ARD? If so, it's possible that the router is blocking the ports needed for ARD to work (3283 and 5900) for that subnet. You might need to talk to your school's network administrator about that.
Regards.

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