Could you please do the following. I'm assuming that you have installed the latest beta version:
1. Fully exit the Viewer.
2. Access the %APP DATA% folder, "Remote Utilities Files" and cut the file config_4.xml . This is Viewer configuration file, it doesn't contain any personally identifiable or sensitive information. Please, send the file over to us (you can send it to email@example.com).
3. Start the Viewer and try again.
4. If you can, please provide information about what Windows updates were installed. You can get this information in Windows Update settings.