I find that it is quicker to unplug the cable then plug it back after the led goes to a flashing amber, indicating a boot sequence. This appears to be quicker than having the MBL do a shutdown/reboot for the MBL/Twonky to be seen by my media player, an AVR. It appears that a reboot on the MBL restarts the daemon listener for a few hours before it shuts down again(!).
A restart of Twonky doesn’t help solve the problem as it doesn’t wake something up; looks like the MBL doesn’t pass info to Twonky for whatever reason.
Would hope that a next version firmware will allos use of what appears to be a generic DLNA server that the MBL Duo docs claim is using.
edit: full reboot vs a partial just to get the ethernet running.