I got reports from several users that communication via the serial port to Tellstick stopped working when they upgraded their Linux installations. They saw the errors:
[ 146.590245] ftdi_sio: unknown parameter 'vendor' ignored
[ 146.590254] ftdi_sio: unknown parameter 'product' ignored
The problem proved to be that in kernel 3.12 the old interface to add custom VID/PID to the ftdi_sio drivers was removed (see commit link).
I have now made new installation scripts using the new official interface, and the installation page on the opennethome site is updated. The new scripts are also in the nightly build.