I have the same problem sycing my appData folder to a backup server. Indexing of the folder works fine, but transfer stops after 1 of 4 GByte. In the posted logfile I can see, that blocked files are checked once a second. Maybe the sync process is busy with checking blocked files once a second and has no time for syncing files when a lot of blocked files have to be checked. Another possible explanation is that all transfer slots (maybe 10) are occupied by a blocked file. In this case the 1 second interval is to low anyway. In my log file it seems that the sync partner requests the file every second. Even a large number of blocked files should not block the syncronisation.
