[stiwi]

Ok, problem solved! Ditch SMB, use NFS:
http://www.johnlarge.co.uk/2012/06/26/os...-xbmc-fix/

Things to note if you decide to follow the guide above:
- I used Textwrangler to edit com.apple.nfsd.plist , but if it doesn't work for you, make sure to download it from the website and NOT from Mac App Store as it won't allow you to do this.
- make sure to run the following in OS X terminal (separate lines) - it will stop (1st command) and relaunch NFS (2nd command):
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.nfsd.plist && \
sudo launchctl load /System/Library/LaunchDaemons/com.apple.nfsd.plist
- in XBMC add NFS manually: add network location / choose NFS and type IP of the share location.

Works like a charm for XBMC Win 8.1 accessing NFS shares from OSX 10.9.