It looks like this problem has been resolved

Nope the problem has not been resolve. we rolled back a site backup. the problem very much exists on upgrade.

always upgrade on a staging platform. Never live.

Ok, you said that you "found the solution" so I thought you resolved it. 

Please check if your site has connection to una.io site to download update and make sure that you have correct key&secret which matches your site URL.

Hi Alex, all is good there. 

I think we have a solution to this issue and will test again when we have some time.

thank you for your help. UNA is a great platform, it’s a pity that it’s so difficult to get solid help.