I'm having some problems with Library Server -- I hadn't used it before in V11, so I can't say if it's unique to this build or not.
I'm not able to load a library using Library Manager, when I set it up manually. I've setup Library Server across a local network. On the client PC, if I manually add the server PC by IP address and port (i.e. 192.168.0.100:81), it accepts it, but does not actually load anything. If I use "Search for Media Servers", it lists the PC by name and port (Workstation33 : 81). If I select that, the Library loads correctly and shows the library's IP/port under Media Center in top center of the screen. The IP shown is the same as the one that was created manually, but does not load when selected via Library Manager.
The second issue, which is more troubling, is that not all thumbnails are coming through. For now, I am sharing only images (jpgs at this point). The view schemes show (i.e. People/Places/Events) and 90-95% of the thumbnails show. I tried selecting "Build Missing Thumbnails" on the client a few times (and also the server), and although it reported doing the task, the thumbnails are still missing on the client PC. If I "play" the image, the fullsize one shows in Now Playing. I also tried connecting and re-connecting, but the same images are missing thumbnails in the view scheme.
EDIT: I was able to get the missing thumbnails by editing the view scheme on the client and changing the thumbnail size to something different. Changing it back to the original worked then also.
-J