You may have tried this already but I'll explain an option just in case.

Unless you're trying to verify a transfer, when logging in with your active key you need to use "jlwkolb/active" as your username in the login dialog.

Also please take into account that there's a bug related to the "remember me" button, which makes it so that if you click it after having entered your username you will need to re-enter your username. Even though the input field still shows your username, the code no longer knows it (this is the bug).