If you have Macs running Maverick, connecting via SMB to a Mac server running Mavericks and Server 3, you may experience a problem after updating everything to OS X 10.9.2. Some have reported an issue where copying files from a 10.9.2 workstation to a 10.9.2 server causes an error -36. In many cases the file is actually copied, or the first file is copied when copying multiple files. AFP connections don’t exhibit this problem, and it has been reported with both Server 3.0.2 and Server 3.0.3.
A bug report has been filed with Apple. See this Apple discussion thread for more details: https://discussions.apple.com/message/24992766