Adding N810 support should be pretty straightforward using the templating engine. Strange it doesnt work on your Desktop, as we did test the release extensivly on both Windows and Linux clients. (Did you add the IIS mime-types, .mp3 audio/mpeg .mov video/quicktime, mp4 video/mp4??). If you password secured Firefly, you will need to edit the config.xml file and enter your password.
You can always drop me #bugreport at http://www.sourceforge.net/ffmcrossfire incl. your configuration (Firefly version, filetype you are trying to play etc) and I will have a look. 🙂
Cheers,
Tony