I couldn't log in to Logos on my Android; kept getting the error message about wrong email/password.
I finally figured it out: the email field is case-sensitive. Sometimes I capitalize the first letter of my name, and sometimes I don't. This used to be important in email; that stopped being so years ago.
I understand that the password must be case-sensitive. But the email? That's totally unhelpful and unnecessary.
[I've posted this in the "Uservoice suggestions" forum.]