Two Computers Using One iTunes Library from NAS

[newtoiphonesdk]

I have my NAS drive setup with all the media on it. I followed the instructions at http://gigaom.com/2008/10/13/one-itunes-library-on-multiple-computers/ to be able to have one library accessed by both computers. I made sure in the Users Settings of each computer to auto-mount the Volume of the NAS where the media is located. However, on our MacBook (2008 edition) running Lion, there is an issue. The Volume auto-mounts and logs in to the user I setup for it, but when I click to play a video from iTunes, it has me log in again to it. After I login, it shows both of the volumes on the Desktop, and works fine. Any ideas on why it is having me login a second time from iTunes? The NAS is a WD MyBookLive