Problems downloading from Opera Web Browser.

Patron came in the other day with trouble downloading books to their Nook.  This patron had been successful before, so we tried to figure what the problem was.  Turns out they had changed their web browser to Opera, which was downloading the documents.  When we tried to check out ebooks from Firefox instead it worked perfectly.  Double check if patrons have switched to a new web browser if they were successful in the past.