Can't save existing file to Samba share

[jnairb]

I'm accessing some files through a Samba share (server reports that it's Samba 3.6.1). If I modify a file and then try to save, I get the following error:

Unable to save z:\usr6\bej\test.c
Path not found

I was able to edit this test.c and do an initial save (creating the file), but after that, a save just fails. Running Beta 1 Windows x64 on Windows 7.