Ok so I do think I have solved the issue this time by running SkyGo "as administrator".
I run SkyGo the desktop app on a work laptop which I have admin rights on. However it appears something somewhere has changed on the policy that is pushed down that has resulted in some file that is written not being readable after it has been written.
I have run it several times as administrator and had no issues. If I run it normally I get the white screen as before.