Found somewhere that starting it with
export EVENT_NOEPOLL=1;transmission-daemon
was enough to let it run flawlessly.
*Unexpectedly means that the rpc-webpage at port 9091 were incompletely rendered and that a new started download stopped as soon as a client was ready to send data.
Unfortunately transgui seems to have a nasty bug when reducing to icon: the icon is invisible and the application is now unusable (where's the config file???).
