By 'device list', do you mean the two boxes in UC Preferences under the BLF/DSS tab, then Properties, I think? Are you sure the extensions are in the correct box? Not in front of a client now, but I recall the available extensions were in the right hand box and needed to be moved to the left. This is backwards from what I think is normal.

Just a reality check to be sure you're looking at the correct extensions.

Jim