I have a similar problem which I haven't ever had until the most recent update. I have around ten files to sync, and they'll begin to sync, then stop syncing, but show download speeds of around 0-1 kbps. I've tried everything I could find on this forum, from disabling relay server, to deleting the .sync file and restarting the program, but nothing has worked yet. The few files that did download to nearly their entire size are still sitting as .sync files. I let the program run overnight for 2 nights now, and they haven't downloaded! I hope this is resolved, BTSync is one of my favorite programs!