I am having this problem on every Mac client I need to connect to.
I am running TeamViewer 13.2.14328 and every client is running the same version as a supposedly unattended host.
In Preferences - General, on each client, the account is assigned to me and my company. In Preferences - Security, on each client, the "Grant Derek Erb easy access" checkbox is ticked and the Personal password (for unattended access) is filled in and works properly.
Even if they reboot the computer I have to wait until they log in to be able to do anything. I can connect to the computer and I see the icons of the user accounts ready to click on one to log in. But I can not click on anything; neither the user accounts nor the Restart / Turn Off links at the bottom of the screen.
The other symptom is that, again I can connect to the client, but I get a blank black screen.
In all of these cases I connect to the client with Log Me In, log in as a user on the client Mac, and then I can connect with Teamviewer. I have been looking in to replacing Log Me In on my client computers for a year now. At the moment I have to have BOTH running on their computers, simultaneously, in order to get TeamViewer to work correctly.
Not an option.
PS: I am posting this here as someone had a similar problem with a server host and that is now marked as solved. My problem is not solved.