I'm having the same problem, looks like it is something to do with this.
Extended attributes (OS X) and file streams (Windows) support
Seems like BTSync is trying to copy the resource fork (Extended attribute) over, but Linux target doesn't have anywhere to store those extra sets of information. (Perhaps file streams are being used for this on Windows.)
One workaround you can do is to do (on your Mac) xattr -c [filename] to remove resource fork from a file, or you can remove extended attribute from the tree xattr -rc *. (While I personally find these information useless for my use, do remember you will lose things like Spotlight comment or other attribute information if you happened to use them...)
A very best solution could be to add "com.apple.FinderInfo" on a new line at the end of the .SyncIgnore file that you can find in the root directory of the folder you are syncing on all you apple machines. I've just done it and it solved the problem for me.
Bittorrent Sync 1.3
in Sync General Discussion
Posted
A very best solution could be to add "com.apple.FinderInfo" on a new line at the end of the .SyncIgnore file that you can find in the root directory of the folder you are syncing on all you apple machines. I've just done it and it solved the problem for me.