I downloaded the app for mac, but I can't log in from it. I can log in online, but not from the app.
Please clarify - how can you not log in exactly? You don't see the login page? You see it, but it won't let you type anything in? The email address is not accepted? Do you see error messages?
In general, as our app uses Safari's engine to work, please make sure Safari accepts third party cookies and that you're online as you try to log in.