i had the same issue after upgrading my desktop and Lappy from 11 to 12 about a month ago. I ended up uninstalling and reinstalling 12, doing a registry wipe using ccleaner, rebooting and then reinstalling 12 which made zero difference. I repeated this and reinstalled 11. still zero difference I dont have installation files for 9 or 10 so ive regressed back to 8 on both machines. Desktop is on XP, Lappy is on win 7. If i try to setup unattended access i get the same no connection message. Both machines exhibit LAN only connection messages, but if i use my partner ID list I can connect, even over hotel wifi from 100 miles away, but.... The link is fragile and if it drops out or gets closed in error, I cannot reestablish a connection with the remote PC unless I call home and get someone to reboot it. before an ID was displayed, now all i have is a local IP address (on both machines). Also cannot sign in to account (computers & contacts option).from either machine except my phone. The GUI refuses to respond to mouse clicks. If the link drops out, i usually get "Teamviewer not running on partner computer" when I try to reconnect. My phone has TV installed on it which has NOT been upgraded and that works fine with both machines. The thing works, just but im no nearer finding out why or what I can do to resolve the issue, which is a real pain when im away and i get a support call from one of my aged relatives!
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