Just a follow-up on this.
Connecting to the library in read only mode gives me previews in the preview mode every time. Just a little bit of a wait.
Connecting via library server gives me nothing (thumbnails but no previews or playback). Both with the "Image conversion" set to 720 jpeg, or set to "No conversion".
I still havent tested with fiddler, but I'd be surprised if it were a network issue on my home gigbit lan.
Also, one question. Are there any concrete plans on implementing xmp sidecar file support for raw images? I find myself becoming more and more dependant on Adobe Bridge and the fact that they dont play nicely together (tagging wise) is causing me major headaches.