Probably it's a wider issue, but I just installed 6.80RC4 and entered my registration info. Newsbin came back with an error "Registration Failed with error Registration Failed - Can't Contact Server"
This is a fresh installation of Windows 10 Pro (Fall Creators Update, fully up to date), with no additional security software which could be blocking it. I verified with Windows Firewall to ensure NewsBin Pro has access and it is indeed not blocked in the firewall.
Is this a beta issue, or a wider issue?
-- UPDATE: It probably is an issue with this beta release, as it appears that the registration does process succesfully although the error message would suggest otherwise.