In the past few days, I could not log into SciFlow:
Something went wrong.
No session found
Please try again. If the problem persist, please reach out to
support@sciflow.net.
Well, I did contact the excellent customer service, and it turns out that they tweaked their cookie settings. Which simply means: clear out your SciFlow cookies, and keep writing!
Didier Ruedin 
Hello Didier, thanks for your post. We added a support article on how to only clear the cookie that was causing the problems here: https://support.sciflow.net/en/articles/4591871-help-with-signing-in
We will also link this below the error message.