Last few hours I've googling and yandexing this problem, but couldn't find something usefull…
I've just upgrade my WD Mybook WE II (white light) to last firmware (v. 01.02.06), so all my third-party programs was deleted..
I installed ipkg and try to install Transmission again. Installation was succesfull.
And when I run transmission-daemon, it's seems to all right, but when I open web-interface - it's load only html-page and daemon dies (so even css and js isn't loading).
Log isn't tell anything - it's just dies, no messages about crash even on debug-level.
Reinstall don't solve this…