I have a similar problem. I have BT on 3 machines. Only one of the three has a problem where it is proportedly uploading 1 file to the other two machines ... for several weeks now.
I'm having the same problem here, though not as severe as others. I have just one or two pesky files that refuse to sync among the 4 clients running BTS. I cannot isolate which files, among the 13GB, are not syncing. Look forward to a fix!!!!
Where is the ".SyncTrash" on the Mac? I could it on my Window machine where I manually removed deleted filde and folders. I would like to do the same on my Mac machines. George