A friend of mine gave me the password to view his deck, however, I am unable to post a comment for it. The comment widget shows up and I am able to fill in the text area, however, clicking the comment button clears out the text area and no comment is posted. I am able to post comments on my own decks as well as other decks that are not password protected.

Thank you for the bug report. I will have a look and I will fix it as soon as possible :)