Share Permissions on deploymentShare$

Hello, I have been using MDT 2013 and recently stripped of the server\Users Permissions to the deploymentShare$.

I have now only the named users (active Directory accounts)Creative Owner, server\administrator and System Account on the security tab of the DeploymentShare$.

I thought then to boot up a client and try to login as a domain account that is not listed in the security tab of the DeploymentShare$ and to my surprise i could login , but then got a blank screen after that.

I thought it would say access denied, but is this because the actual Share Permission (deploymentShare$)is set to Everyone?

Thanks