Thanks for response. Folder is located in "E:\Home\Sergey\Sync" (another partition; FS: NTFS; size: 170 MB). "C:\Users\Sergey\Sync" is directory junction (similar to UNIX symbolic link) to "E:\Home\Sergey\Sync". "C:\Home\Sergey\Sync" doesn't exist. I already tryed to re-add "C:\Users\Sergey\Sync" and got error. "E:\Home\Sergey\Sync" was added successfully. Why junctions doesn't work in BitTorrent Sync 1.3.94?