I use the free version of the software so I can connect to my home pc and to 2 other machines. I've noticed that lately I get this message:
Teamviewer free does not allow connections to customized host module clients with your own company logo. please use the basic host module.
When trying to connect and then get kicked out after 5 minutes and have to wait to reconnect. I'm definitely not using it for commercial purposes but haven't figured out how to correct this. I think I had setup all 3 machines for unattended access as well but now I'm getting prompted for the on-screen password on at least one of the machines.