Create User, can't ssh in

I've just started working with CWP, and I've found an issue where I create a brand new user, making sure to enable access via SSH, and I'm not immediately able to su - <user> as root, or ssh in.

For quite a long time it first says " su: cannot create child process: Resource temporarily unavailable "

Is there anyway to make this work right away? not sure why its so slow.

I use "sudo -s" to change to root, as it inherits the current environmental variables. On my servers, I only have one sudo user and have root login disabled with ssh. And only one privileged account has shell access -- I don't give it to customers by default, only on a case-by-case basis.