I think I have that part fixed now.
I'm running Windows 8.1, x64 with NZBGet running as service under the SYSTEM account.
The problem was that Internet Explorer, when run as the SYSTEM account (account running NZBGet service) it was in the "First-run" configuration mode. So the solution was to run IE as user SYSTEM, which you can only do using psexec
https://marckean.wordpress.com/2010/12/ ... m-account/
After running IE as SYSTEM and doing the first setup, it fixed all those errors and I am now able to see updates available to my platform (it was blank before).
Checking for updates on Chrome now also works.
I haven't actually done an update yet though through the web interface, I'll check it next time the Testing branch is updated.