This script:
touch a
touch b
chmod -w a
mv b a -f
Works fine in Unix folder, but failed in hgfs shared folder ( eg /mnt/hgfs/... ) with this error: mv: cannot move `b' to `a': Permission denied
This is a simpler way to reproduce an issue discussed here http://communities.vmware.com/thread/193589
Do something, it is an obvious bug.