Everything worked for me for Fbreader 0.8.17. It was not so easy to select word (click at the beginning, drag to the end) but finally it worked with stardict. After I installed new Fbreader to select word becomes much easier just click (or double click?) but I got serious interference problem of startdict and Fbreader like you described.
So I decided to degrade Fbreader back. Without this working with strardict is the pain.