Hi Damian, we had the same issue. We found out, that exporting a disabled UseNewUI to the configuration file does not work. I tried to fix the problem and was also not very succesful. Neverthelesse my findings: If you want to configure it per user you have to add the dword(32bit) to the [HKEY_CURRENT_USER\SOFTWARE\TeamViewer] key. If you want to configure it for all users per default you have to add the dword(32bit) to the [HKEY_LOCAL_MACHINE\SOFTWARE\TeamViewer\DefaultSettings] key. On a 64-bit system the key will be stored in [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\TeamViewer\DefaultSettings] . In both cases after opening the settings in the Teamviewer application, and restarting the Teamviewer it works for me. I tried a lot playing with the registry. I also tried to restart the teamviewer service or kill the process and restart it. Nothing led to a success. It seems like the application is not loading the UseNewUI Setting form the config registry during the installation. It seems that it is only being loaded when the options menu is opened and closed again. We called the Support Hotline and opened a ticket for that issue.
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