I see the inbox script is over 3-1/2 years old, perhaps something has changed in the login procedure? In that case, you may need to make a request for a script update (and supply a test account username/pwd to xndevel@gmail.com).
However, first I would clear your cache/cookies, perhaps re-add the Inbox script, and maybe also try deleting the X-Notifier definition for your account, restart the browser, and redefine your account. It's possbile something got corrupted. Of course, you have to be extra careful to make sure you've entered the right username, password... it seems you do have to enter the entire email address@inbox.com to login, and not just the username before the @ sign.
Troubleshoot?
I see the inbox script is over 3-1/2 years old, perhaps something has changed in the login procedure? In that case, you may need to make a request for a script update (and supply a test account username/pwd to xndevel@gmail.com).
However, first I would clear your cache/cookies, perhaps re-add the Inbox script, and maybe also try deleting the X-Notifier definition for your account, restart the browser, and redefine your account. It's possbile something got corrupted. Of course, you have to be extra careful to make sure you've entered the right username, password... it seems you do have to enter the entire email address@inbox.com to login, and not just the username before the @ sign.