ARD 3.7 won't allow connection to any Mac running 3.7 client

Help this is very frustrating and I am seeing the same problem on a number of discussion boards. We have Macs running OX 10.6 - 10.8. I have updated my Apple Remote Desktop Admin account to 3.7. I can no longer connect to any client that is running the updated 3.7 client, though I can connect to those running earlier clients. Is Apple working on a fix to this situation? How soon can we expect it? And is there a workaround for now?

Thanks