I guess we'll have to see if OS X 10.10 (Yosemite) fixes it, but I'm not holding my breath. The people at that macsmbissues web site have apparently given up, as have we.
for more info, but it appears that Apple continues to deny the existence of this problem. See and 10.9.2 Mavericks and can no longer connect to our SMB file share on the network.
Beginning with OS X 10.9.2, SMB connections to Windows 8.1 and Windows Server 2012 R2 (which use SMB 3.02) have been flakey, and we've continued to use the SMB 1 workaround (connecting via CIFS:// from our Macs).