Very strange 
… I just tried it again, and again this
“Oops, The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience…”
came up … Then I “F5”´ved a few times (out of frustration 
) and suddenly the screen changed to
Sorry, there was an error authorizing your account. Please try again.
Then I had to log in again over my oauth2 provider log in site, and then came the “Ops ..” again, and after another F5 I was in …
Uhmm… either I found a serious security problem, or it´s just about timing …
Probably the latter …
What timeouts are there, that I could try to adjust ?
Thanks and cheers!