I've tried entering the auth info multiple times, but still it won't work. I keep getting "Forbidden (incorrect authentication details)" status.
Am I doing something wrong or is there a bug?
Are you using the RSS or the Newzbin Search feature?
As for Newzbin Search, I have my info entered into the "Settings" and so far it is working fine. Had to make sure I had my username and password entered correctly but it worked after I fixed that.
If you are talking about RSS, that is a completely different story.
Let us know which one you are using.