How can I login?

When I try to login to my adobe account, after entering my email and password,

• In caseI enter a wrong password, I get an error message as expected
• In case I enter the correct password, I am just send back to the login screen.

At the moment I cannot read any books in my ADE. ADE ask me to re-register my computer and refuses to do this either.

What do I need to do?