I've got number of the Avalon Nano (https://bitcointalk.org/index.php?topic=779612.msg8841428;topicseen#msg8841428) and have successfuly downloaded and compiled fresh version of bfgminer and run it. It works fine for couple of minutes, then it starts to get slower and finally stall at all. Restarting the bfgminer helps but for same couple of minutes.