I am having the exact same problem as Chris_M.
I will also add that none of the add-ons install correctly as I go through the installation process using the "start here" disk. During this process, when it reaches the "enable" screen after the add-ons are supposedly installed, I receive a pop-up box simply showing the number "2". After installation completes, no icons for the add-ons appear on the web GUI...so clearly the add-on installations failed using this method as well.
I'm using Windows 7 Home Premium, and am attempting to upgrade from the D-Link 323 (bringing one 1TB Seagate drive from the 323 into the 325 with a new 1TB Seagate drive, set up in "standard" mode). I'm not exactly experienced with these sorts of things, so I'm not sure what other info might be relevant.
Frustrating...these add-ons were the reason I upgraded from the 323 in the first place....