It should be working. I guess you don't have enough SP. If I remember correctly, it is about ~ 5000 SP needed to be able to claim an account with RC.
I keep getting a message saying that steem returned no error message, but nothing else happens.
You mean a message stating something like 'Steem KeyChain did not return any error message'? Then it is related to the KeyChain extension and the message from the node is not correctly returned by it.
I have over 6,000 SP, so I think I should be OK there. Half is delegated, and not sure if that matters.
I just tried again and the message I got was, "KeyChain returned no error text." Is there anything that can be done to correct it?
Yes, it matters. You need ~ 5000 (effective) SP.
Ah... OK, thanks for that information. So basically, I can't create any accounts until I recall my delegations. It would be handy to have this kind of information posted where people can see it before they attempt to create new accounts. I can see people with 500 SP trying to create an account each time they earn another 100 SP just to see if it now works for them. They could save the frustration if they knew exactly what was needed.