Permission issues on network folders

I have local Keynote files that I use as a sales templates. My process it to open up one of these go to 'file->duplicate' and then make changes and save the file to a 'clients' folder on my windows server.

I can duplicate the file just fine, but when I go to save it to the network I now get this message since upgrading to Mavericks

Is anybody else having this problem or do you know what I can try to fix it?