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It's not really a bug. The SAMBA protocol was supported in 10.6 but in 10.7 Apple expects users to use their new Windows sharing protocol, which doesn't work. It's a big FAIL and not getting nearly enough press. It may be tied to the way that Windows handles extended metadata, or to Apple's incomplete support of NTFS. Third-party NTFS drivers may help for half of the problem, but you'll need to eliminate the extra metadata that OS X 10.7 Lion cannot handle.