Windows

Corrupted UI or strange colors

Ensure you are running the latest driver for your graphics adapter.

Port 49734 is unavailable, but Windows say it's not in use?

On Windows a port may be reserved, even if it is not in use. https://stackoverflow.com/questions/54010365/how-to-see-what-is-reserving-ephemeral-port-ranges-on-windows

See reserved ports using this command:

netsh int ipv4 show excludedportrange protocol=tcp

A possible fix is to run the commands below. This might cause you to lose internet connection until rebooting. It should free up reserved ports and add the Foldersync Desktop port to the excluded range so it will no longer be reserved by winnat.

net stop winnat
net start winnat
netsh int ipv4 add excludedportrange protocol=tcp startport=49734 numberofports=1