I registered for the database / sotwatch etc. When I login to any of these sites with the SSO my login appears to be accepted ok but then I am presented with a white screen. A quick look in the browsers devtools tells me it thinks that there is a CORS header missing.
Your account was created while we had a database issue, which means that the DB side wasn’t created. I’ll push it out shortly and then you should be able to log in. Give me about 10 minutes.
It’s just a standard error message when FF/Chrome get a response they don’t understand - because it comes from an XHR, they default to assuming that CORS headers weren’t set. If it hadn’t been an XHR, you’d have a 404 or 500 error bubbling through.